i drive an 83 300sd with 259k miles... i have a few oil leaks and blowby and
it uses a little oil plus smoke... A friend of mine just gave me a 1990 ford ranger with 232k miles that has used mobil one since 30k miles so 200k miles on mobil one every 5k mile oil change... it has no smoke, no oil leaks, no blow by, and it does not use any oil....I just thougth I would share that with you guys....

Diesel related, how?

Gas engines rarely smoke unless they are in really bad shape, valve stem seals are worn out, or the oil control rings are worn out.

I've seen gassers with 200K+ miles that run like junk but don't smoke. I've seen some good looking cars with 50K miles that smoke like a train.

The worst I've seen to date was a 94 saturn SL2 with a bad computer coolant temp sensor. It was reporting -13*f coolant to the computer and DUMPING fuel into the engine. It would fill up the 4 car shop with a thick wet cloud of gas/smoke in a few seconds. Amazingly, nothing sparked a fire!

I already know Mobil 1 is amazing, but thanks anyway.

It made a Ford last over 200k!

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200