I have been changing mine and running the valves after 25 passes for years. Recently I have talked with other racers that change 1-2 times a year or one guy that thinks he needed to change it every outing
. I can usually smell the 112 Sunoco on the dipstick after one time at the track but the oil is still clean! I race almost every Friday night all summer and put about 100 passes on a year so that amounts to 4 oil changes
What do you guys do? Am I throwing good oil away after 25 passes?
My bearing look good from one year to the next but I usually change them out every 3 years along with the rings.
Thanks Mike