Re: Re: John Deere B oil change
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Posted by Jeff King on November 16, 1998 at 15:37:08:
In Reply to: Re: John Deere B oil change posted by Gerald on November 16, 1998 at 14:05:10:
: : What weight oil should be used for engine?
: : Owners guide suggests 20W but advice is 50 years
: : old. Would a 10w-40 be better or 30W? Detergent
: : or non detergent?
: : Thanks. : 10W30 is probably best. 10W40 isn't held in high regard by modern engine makers. It has an excessive tendency to gel after being heated to the modern engine's operating temperature. : The most modern of oils are best for an old engine because besides detergents to keep the engine clean they have additives and raw materials chosen to corrode bearings much less, and are made to not gum up nearly as rapidly so keep engine lubrication passages open. : I'd say use the same oil recommended for the 1998 cars and trucks, gasoline probably, diesel may not be rated for the same oil, but can be. : I believe that the much longer engine life we get in cars today is partly due to better oils than we had in the 40s and 50s, not just better engine designs and better engine materials. I'm sure the lubricant makers would agree with that premise, maybe not the engine makers completely. : Gerald I believe in using a high quality 15W-40W that is rated for diesel engine service. Have been using Unocal Guardall, but Shell makes Rotella and Chevron makes Delo. All three are superior oils to those sold for the automobile market and would make a good substitute for straight 20W. My dad bought a BMW 328I a couple of years back. BMW lists Chevron Delo 15W-40W on their recommended alternative oil lists.
Commercial engines go well over 200,000 miles on these oils without bearing failure. Jeff King
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