- Sep 9, 2021
Well, I'm posting my first one here. I've got this mower with an 1985 Onan B43G engine. I've owned this 9 years (about 1400 hours on it), and always used 30W only in It-usually JD Torq Guard or Pennzoil. After getting more interested in researching oils for my F150 4.6L and Jeep Wrangler 4.0 here in BITOG, I am wanting to switch to 15W 40 which is spec'd in the owners manual (also specs 20W 40 but not too available). I've read a lot of threads on this type of oil, and can mostly only find ones like Supertech, Rotella, Delo, Delvac, etc., but most are diesel only rated. I read that Rotella dropped their gas ratting some years ago, so maybe it could be the exception and really still be fine for gas. I'd really like to go with a full synthetic for better engine heat management which I've read about on BITOG. I've got the usual John Deere 318 cooling issues covered with the grommet around the oil filter replaced, and a new firewall insulation kit coming. I'd also like to use the most shear resistant applicable oil. Am I safe to use this type of HDEO without having a gas rating? I'm just trying to hedge against my lack of knowledge of oil, thinking there may be something I'm not considering. I put around less than 50 hours per year on this mower in Tennessee, so a bit hot during summer. Right now, I don't use it in the winter, but am looking for a snow blade for winter. Oil and filter (JD or Wix) changed at the end of each sumner season.