Is 15w-40 appropriate? Why woulld you use it over 5W-40?
Will it be harder on mileage or performance?
Will it be suitable for freezing weather?
15W-40 is what the manual calls for. So yes 15W-40 is appropriate, remember once its warmed up its all 40 weight if its 5W-40 or 15W-40.
The 5W-40 DEO Amsoil has a cold pour point of -51F, 15W-40 is DME is -41F,15W-40 OED is -38F, 15W-40 AME CI-4 is -44, 10W-30 OEC is -36F, 5W-30 HDD
is -58F. So you can see that the operating temps of even the 15W-40 are pretty low. In very cold climates such as Yukon, Northwest Territory, Nunavut and in Alaska a 5W-30 or 10W-30 would be appropriate too. Where temps are -20F or lower for days on end or for multiple nights on end a lighter weight oil is a good thing.
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Last edited by Dirtbikindad393; 11-29-2012 at 12:59 AM.