Synthetic oil change-over

gswcgi wrote:
When I bought my Class A new with a CAT 330HP engine in it I called the CAT factory and asked about synthetic oil. They answered that they didn't recommend or not recommend synthetic oil. However, they were adamant that not changing the oil/filters when they recommended in the owners manual would void the engine warranty regardless of what kind of oil I used.Their attitude was that no matter what oil I chose it should meet their standards. Additionally, they felt that the engine would outlive the RV by many moons.

Strange that they told you that, because they market a synthetic diesel oil that will give you Increased Fuel Economy, Improves protection of the engine and the Diesel Particulate Filter, and even allow you to extend your drain intervals!!!
Cat® DEO-ULS SYN
Must be you didn't talk to one of their lube engineers.