So you are using diesel engine oil in gasoline engines? I know there are different grades of oil and that there is oil to gasoline specs and a different grade to diesel specs. Can the diesel oil be used in gasoline engines? If so, why are there 2 different types of oil?
Some diesel engine oils are also rated for gasoline engines -- they vary, a lot. You have to read the API ratings on the bottles to know what they can be used in.
Shell Rotella T6 diesel oil, for example, can be used in
motorcycles,
if it is JASO rated, but not all T6 formulas are JASO rated... I ran Rotella T6 full synthetic in three motorcycles, now down to just one. They all shared the engine oil with their transmissions; two were air cooled, one is water cooled; all ran flawlessly on it, as long as I stayed within the specified viscosity range, and I used JASO rated formulas.
The devil is in the detailed ratings of any jug of oil.
I put Shell Universal Hydraulic Tractor Oil into my Mahindra hydrostatic tractor transimission, and front end (4 WD, front wheels have a separate hydraulic system). Been running fine, ever since. I sourced it on Shell's site, to make sure it met Mahindra make and model spec's: they recommended two types of oil, and one was the Universal, which is readily available at my my local Fleet Farm stores; the other was a special order, and delivery fees on a 5-gallon bucket of oil was more than I wanted to pay, when I could get something locally, for cheaper, and still within spec's! My independent tractor mechanic said it was good oil to use, and I trust him. Cheers!