Posted 7/29/2014 07:32 (#3991331 - in reply to #3990022) Subject: RE: Engine oil in older diesel motors
Eastern Iowa
I kept some 30 weight around for awhile but ultimately decided to simplify things and run 15W-40 in all the engines. Nothing bad to report so far, from a 1936 A on up to a 9570STS. Usage did not change at all.