"RG" wrote in message
m...

"D&LBusch" wrote in message
...
I have a Mercruiser 5.7 with 450 hours built in 1988. I'm about to lay it
up for the season (northeast). Does anyone have a suggestion for engine
oil? I'm inclined to use 10W30 Dino oil which is what I use in my car.
The boat is new to me so I don't have a "what did you use last year" to go
by. Any ideas would be appreciated? Thanks, David


Hard to go wrong with MerCruiser's own 4-Cycle engine oil. It's
formulated to their specs for their engines.

Multi weight is not recommended. Mercruiser blends 25W with 40W and adds STP
or something similar. But straight 30W or 40W will do the job just as well.
These engines typically die from over heating bad winterizing, or water
injestion before they have bearing, piston, valve, or cam problems.
Jim