PeachParts Mercedes-Benz Forum - View Single Post - ML320 Stopped using oil at 95,000 Miles. Cant Understand.

sdanville · #1 02-11-2004, 10:18 AM

Origional owner is my friend. Barry drove this 1999 new to 90,000 miles. He told me it used a quart of mobil one about every 1,000 miles since new. He also told me it took regular gas.
That Gas statement was honest ignorance.
So I bought it. Added a quart of Mobil one every 800 miles until 95,000. Then the miracle. This is what I changed....
Changed the oil and filter with Mobil One at 95,000 miles.
I've used premium gas since I bought at 90,000 miles.
At 94,000 I unplugged my ERG tube. (caked with goop).
I ran 2 tankfulls of Gumout emmission control cleaner thru it at 95,000 ish. And I add Marvel mystery oil to every tank.
Its been 2500 miles since the last oil change with no measurable oil consumption. I am stumped.
Can a plugged EGR valve cause oil consumption?
Remember it used oil since NEW.
Feb 15 2004 Update. to date..Over 150 people have read my post with no answer. I propose 1) the engine was never broken in and an oil ring on a piston broke free at 95,000 miles. OR 2) some emmission control valve never worked from the factory until I added additives with lubercants to the gas at about 95,000 miles.
3/23/04 update now at 3300 miles since oil change - still no measurable oil use. One mechanic told me the plugged EGR Tube would cause enough pressure in the valve cover to force blow by oil. AND even the too low octane fuel could effect oil use.
IT SURE MAKES ME WONDER how many of these ML320 engines were replaced by the dealer because of oil use...when it could be a simple emission control problem.
4-19-04 update. 3,550 Miles since oil change. No oil added. Oil finally shows a 2/5" drop on the dip stick. Still in the safe area.
5/21/04 at 4200 Miles since change, Oil Light came on. I only added 1/2 quart as I will be changing at the 5,000 mark from now on.