I change the oil once or twice a season...but I don't get to the track as often as I would like (probably less than 40 passes on the oil). Valves, once at the begining...then again if if starts acting or sounding weird.
67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....
