Oil for 90TT posted by lugerz on January 05, 2011 at 11:36 AM
Message
Switching back and forth between conventional and synth and/or brand to brand won`t hurt a thing. It`s an old wives tale. I just drained my fill of Pennzoil dino 10W40 and refilled with Mobil 1 15W50 this afternoon (Oreilly M1 sale). I also bought 5 quarts of Valvoline Synpower 20W50 at Advance for future use (Advance is running a Valvoline sale).