Switching from Synthenic to Dyno Oil?

I have a CAT3126E diesel in my Class A. When I took delivery of the rig I called CAT to ask about the synthetic/dino issue. CAT factory told me they don't recommend either one. However, they said that if I chose to use synthetic it would not change the oil change interval! They also said that if I exceeded their oil change interval recommendations I would void the engine warranty which was 100,000 miles. They ended the telephone call by telling me that if I wanted to spend the extra money for synthetic it was my money and my choice. I have stayed with dino oil and have not regretted the decision. I run a Cummins engine in my Dodge now with 140,000 miles on dino still runs great.

I ran two very large Cummins engines in a large charter boat with dino, sold it with 4,500 hours and neither engine burned one drop of oil between changes when I sold the boat! Those engines ran 24/7 and had an Onan 12KW generator which also ran 24/7 and had only dino in it and had 15,000 hours on it and never burned any oil. Your money, your choice!!