Mobil 1 used since 1983 in all lubrication applications. Engine Oil, Grease, Gear Oil, & ATF - PSF. I let the truck tell me when it needs the engine oil changed. My crankcase holds 6.65 liters of oil. I also have used AC Delco filters and Mobil 1 filters.
I wouldn't use any other type of lube if it wasn't labeled 100% full synthetic.
Motor oils in general are changed to frequently as it is. But to each there own as they say.
I talked to my dealer about running Synthetics in my TAHOE. They basically told me...NOT NECESSARY. I changed all the fluids with regular oils for it's 30,000 mile maintenance. (diff's, transaxle, engine)
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