Amsoil does not make 0W40 so I am thinking of just using straight Mobil 1 however I've been curious to try Amsoil but I dont know if it will be ok to use 5W40 or just stick with the regular Mobil 1
To bad Amsoil does not make 0W40 dont know why they dont. I have the Boxster and a 540 want to switch the oil and see what happens, any good recommendations on Amsoil?
Or just stick with Mobil 1 0W40 for both cars and be done with it????
