'99 3.5L started increased oil consumption around 50,000 miles had the add oil light come on twice between oil change. I had been using Mobil1. I now am trying Castrol High Mileage and had the oil light come on after 2000 miles, needed to add 1.5 quarts. Dealer suggested that the oil control rings can get stuck from carbon build up. GM apparently has a service bulletin on this, involves soaking rings overnight, and cost several hundred dollars.
Has anyone had success with this?
Anyone have information on doing this yourself. I am thinking of replacing the spark plugs myself and if it is not difficult I would try the ring soaking myself.
PS
found this after further searching, see the oil consumption part;
http://www.babcox.com/editorial/us/us100232.htm
http://www.caddyinfo.com/howtooilfix.htm
http://www.gminsidenews.com/forums/a...hp?t-4078.html