View Full Version : Simple oil question

05-06-2011, 10:17 AM
02 Mercruiser mag tow sports

dealer calls for Mercury MerCruiser Full-Synthetic Engine Oil, 20W-40, NMMC FC-W rated

Whats the best option on this thing weight wise? NC here so the summers get a wee bit warm

Ps oil pressure is alil low right now so not sure how that comes into play

Miss Rita
05-06-2011, 10:23 AM
Follow MerCruiser's recommendations. They sell their product around the world, in environments much more demanding than NC. They know a little about engines, trust their advice.

05-06-2011, 10:30 AM
Not sure about your question and while we are at it I have one of my own...I have the 6 litre and

it calls for Penzoil 15w - 40w and the only product i can find is Diesel engine oil.

Is it all right to use this??? I kind of remember someone saying Rotella 15-40 was good...also

thought Synthetic oils are not the best for Marine applications???

05-06-2011, 10:36 AM
Was not really looking at doing fully synthetic is my thing. Didn't know if I should stick with that and if not the weight to go for

SPSinclair 190
05-06-2011, 04:05 PM
I use the mercruiser full synthetic 20w 40 in my 93 prostar and I run 60lbs of oil pressure and NO problems !!