- Dec 27, 2005
This question may have been answered somewhere in the archives but I haven't been able to find a definitive answer. My Yanmar manual calls for an API rating of CD or better. However, it also states that the oil should not have the CG-4 or CH-4 rating. I recently changed oil with Rotella T (this is a new engine). I just noticed looking at the specs on the Rotella bottle that it has the CG-4 and CH-4 ratings along with a slew of other ratings. Question: is the CG-4, CH-4 a problem? considering that the CD rating is now oblsolete and the other additives may negate whatever problems were with the CG-4, CH-4 ratings. Another problem is I can't seem to find Yanmar oil or any other oil that fits the Yanmar specification.