so, has anyone tried the mobil1 fully synthetic 5w30 truck and suv oil. any difference between that and the "regular" 5w30 full synthetic?? just wondering, as i just picked up some for my 06 prerunner, figured id go ahead and switch to synthetic since im @ 20k now!! (also,mobil1 75w90 for my rear locker diff!!)
and one more question(although it may be kinda goofy).....do all the mobil1 filters, such as the m1-102 have anti-drainback valves in them?? im guessing that they do!