On Thu, 07 Oct 2004 16:12:52 GMT, WaIIy
wrote:
OK, Bill. Thanks for the info. Now, what should I put in my 1997, 5.7L
Mercruiser I/O, given that my boating is done in the Chesapeake Bay.

John H

That was also my question. What oil for 1989 5.7 in Cleveland?

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When I was running my 5.7 on Long Island Sound I would use 30 weight
for the oil change at winter lay up but for my mid-summer oil change I
would use 40 wt. Here in Florida I'm running 40 wt year round based
on the advice of my mechanic. Winter time water temps here are
comparable to summer temps in the north east. In the summer the water
is at 85 to 90 and engine cooling can be a serious issue.