My situation is as follows:

1991 300e 4matic with 76k miles. Uses about 1 qt of oil per 1,000 miles. My search of the archives on this topic seems to suggest that:

1) At some point in time, the valve guides and seals will need to be replaced (do them both at the same time, as replacing the seals alone will not fix the problem for very long).

2) In the interim, there could be some benefit in using some type of high-mileage oil formulation. It seems in order of effectiveness on this car, it's Castrol High Mileage first, Valvoline Max Life a close second, and the Pennzoil product a distant third.

Anybody disagree with this?

Thanks

Jay