I think the Merc oil is 25w40 and really isn't much more than the price of
regular oil. I would go with what the marina said unless you do a lot of
hard running or live where it's HOT! The use 40

"Jodon2" wrote in message
...
Just had a new MERC factory rebuilt engine put in 2 months ago and now
it's
time to change the oil in it. Marina that put engine in put in straight 30
weight oil and he said to stick with this grade. Is this ok? Thanks.
Joe