This is weird... but i once switched to Mobil 1 synthetic in my old high-mile 440 crop-duster (Charger). Did a full oil change. That thing used to go through oil almost a liter a week. I only put the Mobil 1 in there because i had 10 free liters and i wanted to see if there was a difference.

It cut oil consumption by more than half.

I have NO idea how this is even possible. I started buying Mobile 1 for it when it needed oil (little over every 2 weeks now), and it ended up being about the same price i was paying before.

Anyways, that aside, it seemed to run a bit better. The exhaust coming into the interior through the holes in the floor and trunk had a distinctly different smell too...