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Q:i own a 1990 omc 4.3 cobra what is a good engine oil to use? is 25w-40 good for this engine.?Asked on 6/22/2012 by nitro from connecticut
A:Manual says 4 qts. without filter change, or 4 1/2 qts. with filter change. Recommended oil is plain old 30 weight. If you asked what people actually use, you'd get lots of different answers. Lots of folks stay with the recommended 30W, and do fine. Others run 10W30, 10W40, etc. and do equally well.Answered on 7/14/2013 by Bluewater Man from Lake Anna, Va.
Q:will this oil work in 1970s inborard outboard engine with flat lifters or will it ruin the camAsked on 10/4/2010 by Anonymous
A:I would ask a mechanic what the recommend for you particular motor.Answered on 10/21/2010 by Bryant from Tech
Q:i own a stern drive, and picked up 25w 40 four stroke oil for an outboard, will it be ok to use this in my stern drive?Asked on 10/6/2009 by Anonymous
A:nope bad for the engine use30w 35 strokeAnswered on 4/28/2010 by jbud from nc