Oil for 3ym20 API ratings

Apr 13, 2015
156
Catalina 309 Port Charlotte
Hey folks - seeing all sorts of conflicting info on the proper oil to use for the 3ym20 engine. A lot of folks recommend Rotella, some recommend the yanmar oil.

However, the only Rotella and Yanmar oil i can find in 10w-40 both reference API ratings of CG-4 and CH-4. The service manual specifically states NOT to use CG-4 or CH-4.

Anybody use an oil that's CD better, but NOT CG-4, CH-4?


Thanks much - Dave -Tampa
 
Mar 20, 2012
3,983
Cal 34-III, MacGregor 25 Salem, Oregon
im not sure why it would tell you not to use that type of oil... look down this list of oil specs for those designations and you can see what they offer.
 
Jun 4, 2009
92
Catalina 309 Swantown Marina Olympia, WA
Dave, My Yanmar dealer recommended Delo 400LE by Chevron since it is easier to find and he didn't have Yanmar oil in stock. The rating is CJ-4 15W-40