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Synthetic oil ?

Old 06-12-2019, 05:13 PM
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Default Synthetic oil ?

Guys, just curious.....with synthetic oils being used for most high-end trucks and cars....why is it not used in boats ? I have a 99 ML430 that I bought new and it now has over 407,000 miles on it with original engine. I attribute the longevity to the Mobil One 0W40 I've been using since day 1 with changes every 10,000 miles.

I know outboards generally stay in the 2000-6000 RPM range, and you would think the synthetics would be ideal for this environment. What gives ?
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Old 06-12-2019, 05:18 PM
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Synthetic oil is being used by a number of brands.
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Old 06-12-2019, 05:23 PM
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Originally Posted by springerfever View Post
Guys, just curious.....with synthetic oils being used for most high-end trucks and cars....why is it not used in boats ? I have a 99 ML430 that I bought new and it now has over 407,000 miles on it with original engine. I attribute the longevity to the Mobil One 0W40 I've been using since day 1 with changes every 10,000 miles.

I know outboards generally stay in the 2000-6000 RPM range, and you would think the synthetics would be ideal for this environment. What gives ?
How did you come to that conclusion?
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Old 06-12-2019, 05:38 PM
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Mobil one is all I have ever used in my four strokes and NEVER any issues, some over 2000 hours....However, my new 200 Verado specifies not to use it but to use the "Mercury" synthetic" blend. Can't imagine why????
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Last edited by bluevein; 06-13-2019 at 03:28 AM.
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Old 06-12-2019, 05:40 PM
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2000 hours and 15 years with Mobil One in my last set...and that was F225 junk...love it and will start with my Zukes....
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Old 06-12-2019, 05:45 PM
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Just don't see it on the shelves at West Marine and its not mentioned much on the forums.

As meticulous as most boat owners are (me included) , you would think brands/viscosity would be a major topic on the forum.

So, as stated, I'm a HUGE fan of Mobil One synthetics. I can usually find it for about $22.00 for a five quart jug at Walmart.

What brand and weight do most outboard manufacturers recommend ? I have a 2013 Edgewater 170CC with a Yamaha 90 Four Stroke.
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Old 06-12-2019, 06:21 PM
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i just usa 10 30 mobil. in the upper

and synthetic in the lower.

why use anything else to save just a couple dollars.
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Old 06-12-2019, 06:26 PM
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Originally Posted by springerfever View Post
Just don't see it on the shelves at West Marine and its not mentioned much on the forums.

As meticulous as most boat owners are (me included) , you would think brands/viscosity would be a major topic on the forum.
look harder. West Marine, Sierra, and Quicksilver (the three most common brands on the shelves at WM) all have full synthetic and synthetic blends.

Also, look harder on this forum. Oil choices are discussed damn near weekly.

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Old 06-12-2019, 06:34 PM
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Synthetic since new never any problems 1000+hours hard running.
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Old 06-12-2019, 06:43 PM
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Default Yamalube

Yamaha have both 10w-30 and 10w-40 synthetic Yamalube. Is actually the best priced oil in my area,
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Old 06-12-2019, 07:00 PM
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I use Mobile One High Mileage in my Yamahas if only because I sometimes exceed the 100 hr oil change interval.
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Old 06-12-2019, 07:01 PM
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I just bought three jugs of Mobil 1 0w-40 at Walmart @ $22 each. That oil is highly regarded and I also am contemplating using it in my F250's.
I think it could be a good choice.
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Old 06-12-2019, 07:11 PM
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Yep, my bad !!

Broke the cardinal rule of any forum..not using the search engine !

Over the next day or two, I will go ahead and do my first oil change on the engine. I bought one of the Yamaha kits a few months back and I will use the conventional oil on this change. Next one, I will probably swap to the synthetic.

Interesting reading and, apparently, very important on the steps you take just to read the dipstick properly !

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Old 06-12-2019, 07:13 PM
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I’m in the engine business and I have yet to see an engine go kaboom from the wrong oil. That said, i’m Not sure why the general public would not just use what the manufacturer recommends. Just so you sleep better.
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Old 06-12-2019, 09:46 PM
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I use Castrol GTX Synthetic blend in my 2009 Honda 225. It meets the manual's ratings. Going on 3400 hrs and going strong.
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Old 06-13-2019, 03:24 AM
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Back to Mobil 1 0w-40 and two issues that I am concerned about..
First is the issue of "making oil". Some believe that synthetic oil exacerbates this problem and report that after switching back to a heavier weight conventional oil that their engines stopped making oil. One guy in particular switched to conventional 20w-50 and reports an immediate improvement. I imagine he'll chime in.
As for me I'm going to switch to synthetic after I get to 200 hours on my new motors. If they are not broken in by then they never will be.
Second is the FCW rating. In the real world I don't know how important this rating really is. Some say that oils that are rated for marine use have an extra dose of corrosion inhibitors that an oil like Mobil 1 doesn't contain. This concerns me because my motors sit for 5 - 6 months over the summer and get used heavily throughout the fall and winter. Many on this forum use Shell Rotella, which is not FCW rated, and have never had a problem.
In my old motors I used Amsoil synthetic and never had a problem but that oil has become harder for me to obtain and it is $12 a qt. vs the Mobil 1 at Walmart that is readily available and $4.40 per qt. in the big jugs.
And finally maybe I should't really care about the cost. I just wrote a check for $50,000 + for the new motors and between boat storage, insurance, fuel, maintenance etc. there goes another $12,000 per year but I hate to waste money when the Mobil 1 will do an excellent job.
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Old 06-13-2019, 04:35 AM
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I order Amsoil on line. Now I don't have to chase down a sales person.
I run it in at 100:1 in the old Johnson on my whaler while idling around and fishing the back parts of inlets.
It almost eliminates any smoke that lingers when there's no breeze. If I know I'm going to run higher rpm's,
I mix it 75 or 50 to 1.
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Old 06-13-2019, 04:45 AM
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I've been running Pennzoil synthetic blend in every outboard I own since the 90's...

I run Amsoil saber in my ice auger and all my 2 stroke power equipment..

if you don't want your 2 stroke to smoke go synthetic.
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Old 06-13-2019, 04:47 AM
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I think there are a number of misconceptions regarding synthetic oils. Basically, synthetic oils have a flatter viscosity curve and better longevity. My F150 has a 140° thermostat, synthetic oil is of no help. I change the oil every 100 hours, synthetic oil is of no help.

If your motor doesn't run hot, and you maintain factory oil change intervals, synthetic oil offers no advantages other than making you feel better that you are babying your water toy.
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Old 06-13-2019, 05:09 AM
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Been using AMSOIL in my two and four strokes for years. It's a little more expensive but I am a preferred customer so that helps. On the two strokes it produces very little smoke and plugs seem to stay cleaner. Have not had to tear down a four stroke so can't comment on those.
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