Originally Posted By: shell_user
What was the first synthetic oil you folks ever used? Do you still use that synthetic also? Mine would be Mobil 1 5w30, now I use Mobil 1 5w20, Mobil 1 0w40 sometimes mixed or as a blend.
M1 5W20 in the old metal can. Started using it in 1977. Have used M1 mostly since then, although I couldn't say that I've used M1 exclusively.