Synthetic (Royal Purple) is OK for us!!!

[Cp1]

while it may be true, RP still has a job to sell its product. And mazda still stands behind their research and cant recommend any type of synthetic oil for their rotary engines for daily use. yes it may have been used in a 1100 HP lemans race car but those cars also run straight distilled water for coolant. sometimes whats best for a race car whos motor is only expected to last for the race it is running in is not best for a daily driver.

Mazda still stands behind its recommendation to only use regular mineral derived oil.