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Here's my first and last opinion on the subject...if diesel engine oil is good enough for commercial trucks and heavy equipment fleets...it's more than good enough for a Chevy gasoline engine.
I second Wayne's testimonial. I use Chevron Delo 400 HD 15w40 in the boat, trucks, motorcycles and lawn mowers now. I'm also on a zinc additive regiment every other oil change (as recommended by several machine shop owners)
15-50 mobil 1 full synthetic, works great, can be had on sale for $5.99 qt. Napa
I hate paying $10.00/qt. for Mercruiser 25W40 if there are others out there that will work. Does any other brand make that weight of oil?
True Jason, But that mercruiser oil isn't full synthetic or even a synthetic blend. The minute it is blend or full synthetic the price jumps to near 10.00 a qt.
$10 a quart? Where are you shopping? You can get a gallon for about $24 at my local West Marine and they show a list price of $27.99. Probably even less at WalMart. There have been tons of threads on oil here. Bottom line is people here use all kinds of stuff. Some use straight up Auto Zone oil to save 5 or 10 dollars on an oil change. The marine oils are recommended for a reason. There are plenty of threads here that explain those reasons.
http://www.westmarine.com/webapp/wc...toreNum=50366&subdeptNum=50396&classNum=50398
Wall mart - $9.99/qt - Maybe that was synthetic, I'll have to look again. The nearest West Marine is an hour away, Just looking for something I can get local. None of the auto parts carry it.
LK
Al, straight sae 40 is acceeptable and can still be bought at some part stores, it says so in EVERY mercruiser manuals I've ever had and still does in my 05 496HOLooking for options for 25w40. Just seeing what other people use. 5.7 efi mercruiser.
LK
Al, straight sae 40 is acceeptable and can still be bought at some part stores, it says so in EVERY mercruiser manuals I've ever had and still does in my 05 496HO