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Old 12-21-2003, 06:33 PM
Senior Member
Join Date: Sep 2002
Posts: 2,485
This may or may not help but here goes. I take care of a 1987 260E(M103) for a friend, who is the original owner. The current odometer reading is 438,XXX miles. I did a valve job w/new guides, camshaft, rocker arms, tappets and a timing chain at 275K. The bottom end is all original. In fact the oil pan has never been off. It burns a quart of oil every 4,000 miles. I've used a variety of motor oils including Castrol, Pennzoil, Quaker State, Valvoline, etc. and I always use an OE filter. I change the oil and filter every 5,000 miles(instead of 7,500). The engine runs as smooth now as it did new. Since this post deals with an ENGINE question I won't list all the other things that I've replaced under the hood. The M103 and M104 short-blocks are quite similar so it's fair to expect the same durability. Also, the M120 V-12 uses an M104 cylinder head on the right side as well. Just my $.02.
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