Posted by INCase on July 11, 2011 at 07:04:28 from (209.221.240.193):
In Reply to: 15w40 oil posted by rodgernbama on July 09, 2011 at 22:22:02:
It "can be" used in gas engines. As others have mentioned, most diesel oils can be used in gas engines. THere are a few (just a few) gas oils that can cross over to diesels.
HOWEVER I would not recommend 15W-40 in newer (last 3-5 years) gas cars/trucks with cylinder deactivation.
Watch out for the new (2007 and up) diesel truck engines must have CJ4 oils so if you go with one oil across the fleet make sure it compatible with all engines. That's getting harder to do. Generally CJ4 is reverse compatable.
One down side is the higher viscosity will rob some fuel economy and the 15W in the winter will be thicker and not get thru the engine as fast in cold start ups. Some of the newer diesel engines are going with 5W-40 instead of the 15W.
I put straight 30SAE in my tractors and lawn mowers. Cars get AMSOIL 10W-30 synthetic.
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