David Rive
Senior Member
What do folks recommend as the best engine oil for the Lehman 135?
Straight 30w, 40w or 15-40w.
Truth is you could pretty much put most any weight oil in a Lehman and it'll run on it for ever.
My October 1978 L120 Manual recommends a range of single viscosity oils between 10W and 40 depending on ambient operating temp and engine speed. And for multi viscosity oils it specifies:Greetings,
Mr. wb. My Lehman 120 manual advises single grade oils of varying weights depending on temperatures. I'm currently using Rotella 30W.
Straight 30w, 40w or 15-40w.
Truth is you could pretty much put most any weight oil in a Lehman and it'll run on it for ever.