The manual for the mini says use 5W-30 API SH or higher. I'm not sure if AA is higher or ZZ is higher. I bought castrol full synthetic oil for $5 a quart and it says the rating is API SM/CF. So does this work with the mini? I read many motor oil threads already and decided to stick with castrol.

Thanks in advance

 

what is the best oil for a mini anyway ?

 

Any good synthetic will work. If Castrol, make sure it's fully synthetic and not synthetic blend. They have a tendancy to advertise everything as synthetic. Many of us use Mobil 1 and haven't had any problems with it. The racers tend to go up market to Redline which is the most pure synthetic out there to my knowledge but you pay $$$ for it.