Originally posted by Heraclid
the best thing you can go is keep up with basic maintenance
I recently changed my own oil, oil filter, air filter, and fuel filter at 30,000 miles and had the front & rear diffs along with TOD drained and refilled at dealership and couldn't believe how "perky" my VX felt afterwards. I really was caught off guard as I expected not to notice anything at all. The air filter didn't look particularly dirty and I blew through the fuel filter and found no restriction or blockage. Apparently the sum of very small increases (air flow, fuel flow, fresh & clean motor oil & less driveline drag) resulted in a noticable improvement (butt-dyno).