Tubs
I would disagree with the factory specs when it comes to CD/AD (plain bearing models) using 24:1. While everyone agrees oils have improved over the years, they have not improved that much to take a chance like this. In the end, it is up to the engine owner to decide, but I feel that factory recommendations like this are a good way to kill these old engines. Let’s remember that it was these types of manufacturer recommendations that came up with the 100:1 recommendation. If one were to read all the limitations (small print), they would realize that 100:1 was a bad idea, just like 24:1 for those old plain bearing engines.
