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Old 11-30-2005, 08:44 PM
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Default Can you use automotive oil in a 4-stroke outboard?

Heard somewhere that you must use "marine" grade oil in the crankcase of a 4-stroke outboard. I can buy it alright, but it's like 3-4 times as much as a premium automotive oil. Can anyone tell me if there is a difference between automotive and marine oils? Thanks!
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Old 11-30-2005, 08:50 PM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

No difference, from my knowledge. Use Mobile 1 synthetic of the proper weight recommended, and it will last for a long time. I work on my own car motors, and use Mobile 1 exclusively. Others will chime in, if I am wrong, but Mobile 1 is the best oil available today!
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Old 11-30-2005, 08:56 PM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

Yamaha factory manual for my F115s states:
4-stroke motor oil, API SE, SF, SG, or SH
SAE 10W-30 or 10W-40
No mention of a requirement that they be a "marine grade".
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Old 11-30-2005, 11:04 PM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

yes you can use auto oil
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Old 12-01-2005, 05:59 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

You only need to check one thing, which are the API grade specifications in your owners manual. Any oil that has the correct rating will be fine -- and that will include some auto oils
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Old 12-01-2005, 06:59 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

Quote:
Reel Boobs - 11/30/2005 9:50 PM

No difference, from my knowledge. Use Mobile 1 synthetic of the proper weight recommended, and it will last for a long time. I work on my own car motors, and use Mobile 1 exclusively. Others will chime in, if I am wrong, but Mobile 1 is the best oil available today!
According to Yamaha mechanic a couple of years ago, Yamaha would not honor the warrenty if synthetic oil was used.

If you are still under warrenty then check with your authorized dealer before using synthetic.

Yes you can and I do use automotive oil in mine. I would like to start using synthetic or at least a blend. Can anyone shed light on this?
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Old 12-01-2005, 07:12 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

Quote:
gary240 - 12/1/2005 7:59 AM

Quote:
Reel Boobs - 11/30/2005 9:50 PM

No difference, from my knowledge. Use Mobile 1 synthetic of the proper weight recommended, and it will last for a long time. I work on my own car motors, and use Mobile 1 exclusively. Others will chime in, if I am wrong, but Mobile 1 is the best oil available today!
According to Yamaha mechanic a couple of years ago, Yamaha would not honor the warrenty if synthetic oil was used.

If you are still under warrenty then check with your authorized dealer before using synthetic.

Yes you can and I do use automotive oil in mine. I would like to start using synthetic or at least a blend. Can anyone shed light on this?
As long as your motor is fully broken in synthetic is the best to use as far as lubrication. Oil must also protect internals from moisture which some brands are better at than others. I read a test recently that considered these and other factors, which included a manuf. brand, possibly Yam but I can't remember. Anyway, Pennzoil came out with the best overall rating. From a standpoint of lubrication though, you can't beat a synthetic. Considering the environment and stress an outboard operates in, I would be using Mobil1 or Amsoil. Then I would make sure to run a 4 stroke to full operating temp at least once a week.
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Old 12-01-2005, 07:26 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

The March or April 2004 issue of Trailer Boats Magazine had an article and test results comparing automotive oils to special 4-stroke outboard oils. It was good reading. You might find a copy at a public library.
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Old 12-01-2005, 07:28 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

Yes!

Proper weight and grade according to owners manual.
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Old 12-01-2005, 07:37 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

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gary240 - 12/1/2005 6:59 AM

According to Yamaha mechanic a couple of years ago, Yamaha would not honor the warrenty if synthetic oil was used.

If you are still under warrenty then check with your authorized dealer before using synthetic.

Yes you can and I do use automotive oil in mine. I would like to start using synthetic or at least a blend. Can anyone shed light on this?
What I read mixed with my dealers comments goes as follows:

The warning about synthetics pertains to classic 2 strokes. If I remember correctly, some full synths leave a residue in the exhaust port eventually choking it. Mixed blend oils that are partially synth are not a problem. It seems the synth components are hard to burn and deposit in exhaust ports. You lose power slowly through a couple of years or so.

Yamahaha and Johnny Evinrude noticed a rise in loss of power hard to diagnose complaints due to exhaust port clogging and warned their dealers only.

I do not know if this warning now extends to DFI's but I assume it does.

If you have a 2S, dfi or not, use mixed blends. But then again they may have solved the problem by now.

According to consumer reports (the one that does not accept commercial ads)there is no advantage whatsoever to using synths if you change your oil as mfgr recommends. It's just a paliative for the insecure. But according to GM you should use only Mobil 1 on the Corvette engine which requires 15k mile oil changes. In reality it requires an oil change at about 12k when the monitor says it's down to 15%. I assume GM is using the only advantage synths have - long service life.

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Old 12-01-2005, 07:52 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

About Penzoil...

There is another brand called PitPen. I got some of that stuff once at my local discount store thinking it was Penzoil. After I got it in the truck I realised there were no lab marks on the bottles. I looked a little closer and there was fine-print saying "...when economy is the most important thing, use PitPen!"

I changed the oil and filter again the same day and believe me, I checked for lab marks!
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Old 12-01-2005, 08:01 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

IMO pure syn may be a bit more protective but not for the money - the major advantage of syn is that you can go a long time between changes and still get good lubrication. The only reason many car mfrs recommend it is it alows them to extend the serrvice intervals which many of them pay for under "free maitenace" and it keeps their warranty costs down. What they are not telling you is a 15K mile oil change leads to the oil forming as Jello in your crankcase....still working good but JELLO....
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Old 12-01-2005, 08:08 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

Hey, what about the lack of OEM (Yamaha, Bombardier, Merc, Etc) special additives that are not in regular four stroke oils?

You know, the ones that are added to OEM branded two stroke oils that make them worth their 100, 200 and more percent premiums!
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Old 12-01-2005, 08:08 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

Quote:
gary240 - 12/1/2005 6:59 AM
Quote:
Reel Boobs - 11/30/2005 9:50 PM No difference, from my knowledge. Use Mobile 1 synthetic of the proper weight recommended, and it will last for a long time. I work on my own car motors, and use Mobile 1 exclusively. Others will chime in, if I am wrong, but Mobile 1 is the best oil available today!
According to Yamaha mechanic a couple of years ago, Yamaha would not honor the warrenty if synthetic oil was used. If you are still under warrenty then check with your authorized dealer before using synthetic. Yes you can and I do use automotive oil in mine. I would like to start using synthetic or at least a blend. Can anyone shed light on this?
Where in Yamaha literature, writing, documentation does it say no synthetic! Don't want to hear Yamaha tech said, Yamaha mech said,Yamaha rep said. Where, oh where, does it sayin plain old writing, owners manual, tech data sheet, or what ever, don't use synthetic. I haven't conducted an extensive search, but if synthetic wasdetrimental to use in a Yamaha, surely it would state the fact right in the owners manual. So please save us from ourselves, bring forth the proof!
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Old 12-01-2005, 08:17 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

Quote:
Glen E - 12/1/2005 8:01 AM

IMO pure syn may be a bit more protective but not for the money - the major advantage of syn is that you can go a long time between changes and still get good lubrication. The only reason many car mfrs recommend it is it alows them to extend the serrvice intervals which many of them pay for under "free maitenace" and it keeps their warranty costs down. What they are not telling you is a 15K mile oil change leads to the oil forming as Jello in your crankcase....still working good but JELLO....
Glen´s advice is right on the money.

No sense going synthethic with the very frequent service schedules that OB´s require, and cars do not. If you don´t use the OB, I would change oil 2X a year for moisture considerations but Sythetic will not help you more than regular oil here.

All OEM´s say they put Secret Addititives in, but if your manual says you can use an API SE, SF or SG, you are covered in all ways including warranty. Anything else, is just Snake Oil talk.
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Old 12-01-2005, 08:21 AM
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Default Re: Can you use automotive oil in a 4-stroke outboard?

Quote:
twentynine - 12/1/2005 9:08 AM



Quote:
gary240 - 12/1/2005 6:59 AM
Quote:
Reel Boobs - 11/30/2005 9:50 PM No difference, from my knowledge. Use Mobile 1 synthetic of the proper weight recommended, and it will last for a long time. I work on my own car motors, and use Mobile 1 exclusively. Others will chime in, if I am wrong, but Mobile 1 is the best oil available today!
According to Yamaha mechanic a couple of years ago, Yamaha would not honor the warrenty if synthetic oil was used. If you are still under warrenty then check with your authorized dealer before using synthetic. Yes you can and I do use automotive oil in mine. I would like to start using synthetic or at least a blend. Can anyone shed light on this?
Where in Yamaha literature, writing, documentation does it say no synthetic! Don't want to hear Yamaha tech said, Yamaha mech said,*Yamaha rep said. Where, oh where, does it say*in plain old writing, owners manual, tech data sheet, or what ever, don't use synthetic. I haven't conducted an extensive search, but if synthetic was*detrimental to use in a Yamaha, surely it would state the fact right in the owners manual. So please save us from ourselves, bring forth the proof!
thank you..thank you..thank you..I don't know why anyone listens to a tech or dealer exclusively - I call "the source" (mfr cust realtions) if I ever want to know anything that might be open to "opinion" dealers can't be trusted they were listening that morning in training class....

you would not believe what some dealers are tell verado owners regarding the care and maiteneace of their engine...that's why I created my group and everything gets bounced off the merc tech guys before I publish it...

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Old 03-04-2011, 02:02 AM
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mobil 1 15-50 in my 2.8 s-10 with 250,000 mi, same for ny gmc canyon with 50,000. this is with up to 20,000 mile change intervals. i just don't think i will use it in my yamaha f115, unless convinced otherwise. it gets changed at 50 hrs. so far using yamajunk 20-40, but at 60.00 bucks a change, i think i can find cheaper and better.
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Old 03-04-2011, 05:50 AM
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r bruce,

It would be best to start a new thread if you want to talk about synthetic oil in your vehicles and outboard. Use the search engine first as the subject has been hammered to death over the years.

The thread you just responded to is almost 6 years old and very out of date.
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Old 03-04-2011, 06:03 AM
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Yes you can use motor oil in your 4 stroke as was stated. However True Marine 4 stroke oils have additives to help prevent rusting. Here is what Amsoil has to say about their Marine grade Synthetic oil. And yes it is approved by NMMA, API and FC-W testing as well as all Outboard manufacturers.
This part is special for Glen and from Mercury:Marine Synthetic 10W-40 is recommended for use in place of 25W-40 as specified by Mercury®.


PRODUCT DESCRIPTION
AMSOIL 10W-40 Formula 4-Stroke® Marine Synthetic Motor Oil (WCF) is a premium quality synthetic formulation engineered for the harsh operating conditions of marine environments. It withstands the intense mechanical action of continuous, high RPM operation to deliver superior viscosity protection. Formula 4-Stroke® Marine Synthetic Motor Oil is specially fortified with a heavy treatment of advanced additives that protects motors against wear, rust and deposits. It excels in both high horsepower applications and all-day trolling conditions.

4-Stroke Outboard Motor Warranty Certified
Formula 4-Stroke® Marine Synthetic Motor Oil is certified by the National Marine Manufacturers Association (NMMA) for use in four-stroke outboard motors. This high quality oil demonstrates outstanding performance, exceeding the NMMA “FC-W” (Four Cycle-Water) specification requirements. Formula 4-Stroke® Marine Synthetic Motor Oil fulfills the warranty requirements of four-stroke outboard motor manufacturers.


• NMMA Registration #FB-30010B 10W-40
Superior Protection Against Engine Wear
Marine engines operate under high loads and RPMs for extended periods of time, causing traditional automotive oils to break down and lose viscosity. To ensure good protection, the NMMA set minimum shear stability requirements for FC-W. AMSOIL Formula 4-Stroke® Marine Synthetic Motor Oil greatly exceeds the FC-W shear stability requirements, outperforming competitive oils to deliver a superior lubricating film. Formula 4-Stroke® Synthetic Oil also contains robust anti-wear additives that further reduce wear in metal-to-metal contact regions.
Excellent Anti-Rust Performance
Marine engines are prone to rust, leading to uncontrolled wear and premature engine failure. However, good rust protection is not natural to engine oil. It comes only by design. Formula 4-Stroke® Marine Synthetic Motor Oil is fortified with a special anti-rust agent, even more than required to pass stringent NMMA FC-W anti-rust testing.
Applications
AMSOIL Formula 4-Stroke® Marine Synthetic 10W-40 Motor Oil (WCF) is recommended for gasoline fueled four-stroke outboard, inboard, inboard/outboard (I/O) and personal watercraft motors. AMSOIL WCF motor oil is recommended for the following applications whenever an SAE 10W-40, 15W-40, 25W-40 or straight SAE 40 oil is called for:
Four-stroke outboard motors: Honda®, Mercury®, Yamaha®, Johnson®/Evinrude®, Bombardier/BRP®, Suzuki®, Nissan®, Tohatsu®
Inboard and I/O: Mercruiser®, Volvo Penta®, OMC®, Chrysler® Marine, Crusader®, Marine Power®, Chevrolet®, Ford®
Personal Watercraft: Honda®, Yamaha®, Bombardier/BRP® (Sea-Doo®), Polaris®
Note: AMSOIL Formula 4-Stroke® Marine Synthetic 10W-40 is recommended for use in place of 25W-40 as specified by Mercury®.
NMMA FC-W • API SL



Service Life
Four-stroke outboard motors and personal watercraft applications: Due to potential fuel dilution or water contamination, change oil at the engine or watercraft manufacturer recommended interval.
Inboard and I/O applications: Change oil at two times the engine manufacturer recommended interval or one year, whichever comes first.
Mixing AMSOIL
AMSOIL Formula 4-Stroke® Marine Synthetic Motor Oil is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils will, however, shorten the oil life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.
Aftermarket oil additives are not recommended for use with AMSOIL motor oils.
Health & Safety
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS). MSDS’s are available upon request at 715-392-7101 or on our website. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.
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Old 03-04-2011, 06:05 AM
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Here is my take on this. On the rig that I have owned for two years I have Yamaha F115's. I am a Castrol guy, having used their oil in my old Triumphs and MG's for years, and believe they make a fine oil.
I changed my motors over to Castrol Syntec. At the time they were 7 yrs old and had 340 hrs. With the same basic load on the boat, I realized 200 more rpm wot. I was told ahead of time that might be possible, and for my motors it was. I use their product in many of my cars and buy in case lots. For my F115's I follow the recommended 100 hr changes.
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