Valve stem seal conundrum
 

Did the valve seals on the 260e... was burning a quart every 350 miles... 214k
Now not burning or going through any oil.

Did the valve seals on the 300CE... was burning a quart every 600 miles 165k
Now burning oil at a quart every 400 miles. although I am using 15w-40 instead of 20w-50

I did not use the plastic protectors on the intake valves on either car.

I was hoping that this would stop the oil problem in the CE.. the 260E i figured probably needed a valve job, but apparently not...

Maybe the CE does.. or i wonder if i scored the intake valve seal stems... I do have another package of seals

Both cars run perfectly.

Valve Seals
 

Always Install The Plastic Protectors Over The Valve Stem Before
Install The Seals

Could be the rings or just a single ring. Valves aren't the only way to burn oil. I don't think that failure to use the plastic protectors would totally destroy the new seals. It is best do use them but I don't think failure to use them will affect the performance of the new seals that much.

The 103 motor uses VG seals regularly, I've never seen a VG seal problem in a 104 motor. I'd look elsewhere.

Steve... the CE has the 103 motor since it is a 1989...

I guess in a few weeks i will pull the spark plugs and see if they are oil fouled..