113 Oil consumption
OT:
Jon, hope the C55 is treating you right! I regret selling it...often. Post some pictures, I miss that thing, especially the interior.
Depending on year, it is likely that one of the PO ran it with regular oil and screwed up the rings, pistons, etc. Late 90s dealerships were filling these engines up with non-syn so there were a lot of repairs to be made, much cheaper to say it is normal than admit you should have been using syn. The theory is that because dealership was running reg oil, that practice trickled down to repair shops, service shops and DIYers. It is likely that the knowledge of using the upgraded oil would have taken some time to get out including the misconception that some may have held from previous practices. My newer engine (5.4 n/a) is out of a 2002 and dealerships had already switched over to full syntec by then. So depending on if you had an owner who brought the car only to the dealer or a knowledge mechanic, you'd have an engine that runs well today.






