The guides on my brother's SDL are worn at 275,000 miles -- he's
having new guides installed and reamed to fit the valves correctly
while rebuilding the engine.
I would think that the 300,000 mile mark is about as far as one can
get without doing a valve job on these cars -- even Benz can't make
wear-proof engines. The bottom end will be fine, so long as it's not
been abused, but the valve guides and seals are toast by that milage.
Pretty cheap for a brand new engine.
Peter
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