During one of my PMS at a toyota dealer, I did'nt use their toyota motor oil. I had my own oil I bought from Total. Sabi ba naman ng SA, kung may masisira sa makina bec of the oil void daw warranty. Pero recently at Isuzu and Ford, I use my own oil which is mobil and they don't mention anything. I just tell them I brought along my own oil and they just cross out the engine oil on my PMS. Walang cheap comments about warranty