Join Date: Jan 2003
Location: Maine Coast
Thanked 270 Times in 207 Posts
Rep Power: 17
Do Not Put Synthetic In AN Older Engine
I've tried in numerous times on automobiles and had oil leaks within 2-3K. I did this with three Volvo's and one Mercedes all engines had no oil leaks prior and then all of a sudden multiple leaks. Synthetic is a great lubricant but it also finds any possible weakness and can make old engines leak. Use a good Diesel grade oil and change often. I use Rotella 15W-40 and change every 40 hours. A friend did the synthetic conversion on his Yanmar and had 2 oil leaks within two weeks one requiring the engine be removed to fix it.. If Rotella is good enough for the truck fleets it's good enough for boats. Now if you had a new just broken in engine with 100 hours I'd say do it but you don't...
-Maine Sail / CS-36T
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