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Old 04-17-2010, 02:44 PM
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Default synthetic oil in outboards

hi guys i havea150 yamaha 4stroke i did an oil change and used 10 30 synthetic im justwondering if it will hurt my engine as i was later thinking about it anyinfo would be greatly appreciated thanks.sgino.
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Old 04-17-2010, 02:47 PM
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A good number of folks use synthetic in their 4 strokes. Most changed over around 100 hours.
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Old 04-17-2010, 03:32 PM
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Synthetic oil will not hurt your 4 stroke outboard but I'm not sure it's going to help much. My Yamaha F150 has a 140 degree thermostat. Dino oil will have no problem keeping it's viscosity at that operating temperature.
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Old 04-17-2010, 03:36 PM
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I changed my F 115's over to Castrol Syntec (which I have used in ALL my gasoline motors for many a year) last Summer. 75 trouble free hrs. I expect to stay on the 100 hr schedule as well.
One thing I noticed at first was a 200 rpm increase at wot after the change..
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Old 04-17-2010, 03:39 PM
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I'm a huge believer in syn oil in all my engines;cars and boats...I have only had one problem in my outboards - in one out of 4, some of the engine seals weeped a bit when I changed to syn. Changed back to Dino and it stopped.
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Old 04-17-2010, 03:56 PM
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I'm a huge believer in syn oil in all my engines;cars and boats...I have only had one problem in my outboards - in one out of 4, some of the engine seals weeped a bit when I changed to syn. Changed back to Dino and it stopped.

Damn Verados....
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Old 04-17-2010, 04:21 PM
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Thats All i run in my Verados. 15w50 Mobil 1
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Old 04-17-2010, 05:37 PM
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I use amsoil 4stoke marine 10w 40 / I dont think you sould run car oil in a boat engine
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Old 04-17-2010, 05:49 PM
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I use amsoil 4stoke marine 10w 40 / I dont think you sould run car oil in a boat engine
Would you like to offer any evidence to support your statement above?
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Old 04-17-2010, 06:05 PM
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I use amsoil 4stoke marine 10w 40 / I dont think you sould run car oil in a boat engine

Its all the same
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Old 04-17-2010, 07:07 PM
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Would you like to offer any evidence to support your statement above?
The additives they use in the marine oil is different.
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
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Old 04-17-2010, 07:57 PM
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The additives they use in the marine oil is different.
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

Yes FCW oil is made for outboards and has a special additive package. With water cooling they don't run that hot and it is never very cold when I start mine,; so Dinno FCW oil is better than most Synthetic oil that doesn't have the additive package. Amsoil is the only Synthetic oil that I am aware of that meets FCW standards, but I don't know that it is worth the extra cost?
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Old 04-17-2010, 08:03 PM
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Obviously some oil manufacturers/distributors whose oils would easily pass the NMMA Registration #FB-30010B 10W-40 tests don't go to the additional cost of doing so. NMMA may be a non-profit association, but as most of know non-profits are very similar to for-profit corporations with the ability to generate cash flow to benefit their employees and members.
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Old 04-17-2010, 10:47 PM
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I'm sure an engine inside will rust with "car oil" coated inside it.
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Old 04-17-2010, 11:53 PM
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As an outboard dealer we were told to never ever use synthetic oil in our outboards.....SO that's what we told our customers........Now the manufacturer has come out with 4 stroke synthetic oil and it's ok to use it.....I said "But you said you can't " they said it's ok we mix it with Dino oil and I said But???? you said you can't mix the 2 oils together....and they said it's ok.....GO FIGURE.....Now I look like an idiot to my customers!!!
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Old 04-18-2010, 03:40 AM
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Quote:
Originally Posted by homesite View Post
I'm sure an engine inside will rust with "car oil" coated inside it.
I am sure the area that is coated with oil is fine but the oil will collect as the engine sits and not used. I am sure that the additive package is different and using non FCW might give your manufacturer and out if you have failure.

Last edited by v70cat; 04-18-2010 at 04:03 AM.
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Old 04-18-2010, 04:30 AM
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Back in the day when Mobil 1 was the only Synthetic that I know of it said you didn't need to change your oil for every 20K miles.

So I ran a 1993 Honda Civic Si for 180K miles on Mobil 1 changing every 15K just to be safe.

The only thing I know is my car ran great and I changed the oil less.

Obviously some do but I don't bother with my HPDI's but I would suggest that a good synthetic in a 4 stroke means less frequent oil changes - especially at the low rpm's and temps that it will be running so it will maintain molecular integrity longer.

So the price is offset by less oil changes and so is your hassle.

However, if the manufacturer still recommends the same oil change frequency with full synthetic then I just don't see the point?

All you mechanics out there can correct me if I am wrong but an F150 should be able to go double the hours on Mobil 1.
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Old 04-18-2010, 08:08 AM
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Why is it so hard to do what the manufacture says , you know , Read your owners manual and follow it .

I don't have a extra $18,000.00 laying around to burn just because " It SHOULD WORK "

To the OP , are you the kind of guy that has sex with a prostitute and then puts on a Condom ?
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Old 04-18-2010, 08:39 AM
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If I hang around here long enough I will give you annual reports of using Castrol synthetic in my 4 strokes...

I have used Castrol since high school..all I drove was old British roadsters. They would overheat and score a crank before you realized it. Castrol 20w50 oil has without a doubt saved more of these motors than I could imagine. Those motors loved the higher viscosity.

Somewhere around the 80's I started using synthetic. In everything that had a motor in it. Pressure washers, lawnmowers, yard tractors, and my Yamahas.

I started with my '86 Yammy 90 after it was 4 yrs old. 2 stroke synthetic. Can't tell you how many hrs was on that rig, but it and everyone since then, including these has used it. I dunno..if something works, stay with it....

Oil wars..ya gotta love em...
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Old 04-18-2010, 08:44 AM
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Quote:
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Why is it so hard to do what the manufacture says , you know , Read your owners manual and follow it .

I don't have a extra $18,000.00 laying around to burn just because " It SHOULD WORK "

To the OP , are you the kind of guy that has sex with a prostitute and then puts on a Condom ?
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