I have used 'Penrite' oils for the last 10 years. I used it when I raced my RX2 as a club car for 4 years, that was a good test. Never had a need to change brands. Since owning the stagea I have used HPR 10 eng. oil. Have been quoted MGO75 for Attessa (am going to double check), SIN 75 for the diffs. I fitted DC tranny cooler 2day and topped up with SIN ATF.