Friend of mine has a 160k-mile '00 Saturn coupe that is using enough oil to foul spark plugs in two years of driving. He's a student and needs to affordably nurse it along at least until graduation.
I was going to suggest using a heavier oil than the 5w-30 it calls for. I think a 10w-40 would be safe, but I have seen many owners manuals over the years that specifically say to not use a 40 weight oil. I assumed that was mainly for economy reasons, and especially living in Texas, that there wouldn't be anything wrong with it.
Do you agree that 10w40 would probably be a better (and perfectly safe) choice here? Will it make much difference in the oil consumption? Any other product he should use?