That's probably what it really wants, ISO 100 hydraulic oil. Not an automotive detergent 30 weight. This is all very interesting (to me).Is non detergent 30 oil the same as SAE 30w oil?
Carl Griffiths, Former Founder Fellow of Inst of Diag. Engineers
Answered Jul 24, 2018
Er! Sort of! You will find it VERY difficult to get non detergent motor oil, except for some aircraft supply stores.
Now lets look at you question:
1./ There is no such thing as SAE 30w! The SAE J300 spec refers to SAE 20W and below and SAE 30 and above. There is no low temperature requirement for SAE 30, only a viscosity at 100 degrees C.
2./ 30 oil or 30 weight oil means nothing at all! It is just a lazy way to say SAE 30 motor oil.
3./ A few, and I mean a very few older engines specified non detergent oil. Of these few, only a very small percentage will actually be harmed by a detergent oil, or even a modern fully synthetic oil.
I had a friend who used normal Castrol SAE 30 in his Lycoming aero engine strictly against regulations. His engine lasted much longer between overhauls and showed much less wear and deposits compared to the approved oil. If he was found out, he would be grounded by the FAA!
If you REALLY NEED SAE 30 non detergent oil, you can buy ISO 100 straight mineral industrial oil which is identical or Use ISO 100 R&O hydraulic oil with you may find easier to get.
Another answer:
Oh, and still not sure on the axle/diff but possibly 10W-30....yeah. I think I'd be more likely to change that, too.SAE30 is a single grade oil. It is most commonly used as the hydraulic oil in tractors and other agricultural machinery.