I have a 24,000 lb motorhome towing 5,000 lbs. Currently running the Castrol 0W-30 and have had good results with this oil. This oil can be hard to find, especially on the road. Looking for a gasoline motor oil that is in the upper range of the 30W scale at 100 degrees C that is also more readily available. This engine sees high RPM going up and down hills since engine braking is required to keep things under control without using the service brakes. Was looking at the Penzoil Platinum Euro formulas but in reading they don't seem to be recommended in a gasoline motor on BITOG. Don't really want to go to a High Mileage oil at this point either.
Suggestions?
Suggestions?