Well, while we're on the subject....There's been plenty of posts on how great Royal Purple is. I was intrigued enough to look up my nearest dealer on the Royal Purple website, and drive the 60 mile roundtrip to buy the synthetic 10W40, transmission fluid, and Max-Gear lube for the front and rear diff's. I ended up paying $5 a quart each for the oil and Max-Gear, and $8 a quart for the tranny fluid. I had my trusty mechanic change all the fluids last Friday, and left Saturday for a 400 mile (one way) journey from Central Jersey to the Outer Banks of North Carolina. Judging by the performance, this is probably the best investment I've made for my VX yet. The truck seems to shift smoother, ride easier, and is generally quieter than before. Mileage is better, though how much better is hard to quantify, as the trip was mostly highway driving, but I'd estimate 320-330 miles per tank, which is a new high for my truck, as we'll as my particular style of driving (Right foot is 5 sizes larger than the left). So far, Royal Purple fluids are worthy of the hype...I wish I had known about R.P. for my previous vehicles.