what oil in 400 EX?
#6
#7
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You'd be hard pressed to find modern automotive oils that don't meet & exceed those older specifications....
If you're concerned with the lack of zinc & friction modifiers, stick with a heavier weight oil like 20w50 or 15w50, which is good for an air cooled engine anyway. The lighter weights are formulated more for emissions & contain less zinc to protect catalytic converters, and friction modifiers for less parasitic loss.
I have been using Mobil1 15w50 in my EX for approx a year under racing conditions.
I have also used other automotive synthetics & non-synthetics in my other bikes (ATC200X, ATC350X) for years w/no trouble from the engine or clutch/tranny.....
If you're concerned with the lack of zinc & friction modifiers, stick with a heavier weight oil like 20w50 or 15w50, which is good for an air cooled engine anyway. The lighter weights are formulated more for emissions & contain less zinc to protect catalytic converters, and friction modifiers for less parasitic loss.
I have been using Mobil1 15w50 in my EX for approx a year under racing conditions.
I have also used other automotive synthetics & non-synthetics in my other bikes (ATC200X, ATC350X) for years w/no trouble from the engine or clutch/tranny.....