Oil Advice Needed
Senior User
Joined: Mar 2007
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Originally Posted by jimandmandy
A 351 is an automotive-based engine, nothing even close to an air-cooled aircraft engine. Exactly how are all of these preignition-causing deposits going to come from?
Jim
Jim
Having said that, I love Delo and have run it in everything I own, but I don't think it would be the best choice for a boat. Fact is Chevron's website recommends their "Supreme" auto oils for marine use, not their HDEO Delo. Did I not ask earlier if MerCruiser oil was available? Aircraft oil is an acceptable alternative if nothing else is available.
http://www.offroaders.com/tech/snake-oil.htm#four
Post Fiend
Joined: Jun 2001
Posts: 5,228
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From: Running Springs CA
I have used Aeroshell 80 (SAE 40) in non-aviation engines and have been disappointed. Accelerated cam and lifter wear, along with rapid varnish buildup was what happened when I used it in a motorcycle. I would never risk a flat-tappet V-8 to an "ashless" oil with no ZDDP. MerCruisers are Chevy-based so I doubt that they would have a "special" oil that was not just repackaged PCMO for dealers to sell at a markup. If his engine was roller cam, then I would just go with the Chevron Supreme, like any other modern Ford.
Jim
Jim
Senior User
Joined: Mar 2007
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arctic,
I should have said something before, but... on the oil the marine shop sells, was there an API donught, and if so what did it say? That alone would answer all of your questions. Having read this thread a second time, I believe you'd do well with any automotive oil. True they have all the additives you'd need, but they contain lower concentrations than HDEO do, thus they are less likely to leave detonation causing deposits.
I haven't been on a boat in a few years, but if memory serves correctly most marine engines run a water temp of about 160* With that in mind I'd be inclined to go with a 5W-30 or 10W-30 automotive oil and change it often. Chevron "Supreme" fits that bill.
http://www.chevron.com/products/prod...motoroils.shtm
I should have said something before, but... on the oil the marine shop sells, was there an API donught, and if so what did it say? That alone would answer all of your questions. Having read this thread a second time, I believe you'd do well with any automotive oil. True they have all the additives you'd need, but they contain lower concentrations than HDEO do, thus they are less likely to leave detonation causing deposits.
I haven't been on a boat in a few years, but if memory serves correctly most marine engines run a water temp of about 160* With that in mind I'd be inclined to go with a 5W-30 or 10W-30 automotive oil and change it often. Chevron "Supreme" fits that bill.
http://www.chevron.com/products/prod...motoroils.shtm
Senior User
Joined: Dec 2006
Posts: 171
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I got out my manual for my boat engine. Here is the oil recommendation. Above 50 degrees, F, use 40 weight oil, 32 to 50 degrees F., use 30 weight oil, below 32 degrees F, use 20w50 oil, use an automotive oil with an A.P.I. classification of SH.
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Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
Thanks Guy's. 160* is the ideal temp for any salt water to not leave salt deposits. All though I am fresh water cooled I have sea water pumped through the heat exchangers.
Both oil advice is good. I'll run the 15W40 for now as I have it. And when the weather cools or first oil change I'll go with 10W30 if I can fined it with all the goodies in it.
Both oil advice is good. I'll run the 15W40 for now as I have it. And when the weather cools or first oil change I'll go with 10W30 if I can fined it with all the goodies in it.
New User
Joined: Nov 2008
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I live in san antonio, tx and have a 2003 F-350 turbo diesel which the owner's manual say to use 15w-40. I would like to start using synthetic, but can only find 20w50. Can 20w50 be used without fear of some kind of engine damage? The truck has approx. 40,000 original miles.
Thanks,
Walt
Thanks,
Walt
Posting Guru
Joined: Jul 2006
Posts: 1,720
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I live in san antonio, tx and have a 2003 F-350 turbo diesel which the owner's manual say to use 15w-40. I would like to start using synthetic, but can only find 20w50. Can 20w50 be used without fear of some kind of engine damage? The truck has approx. 40,000 original miles.
Thanks,
Walt
Thanks,
Walt