How often do u change oil ?
How many laps is each race (Heat, trophy, Main) Total ?
Brand of oil ?
Stock or multi ?

We change it after every 4th race night - oil and filter both. Castrol Syntec 10w-40 full synthetic. 04 636 on methanol. You'll probably get a dozen different answers to this, but this is a normal schedule for a lot of competitors.

Thanks for responding !

we change ours every time we run and also add lucas oil treatmen