I second the valve guide seals, they are relatively cheep to replace (you don't have to take the head off.)

That engine, around that vintage, had valve guides that wore prematurely. You would have to take the head off to change them, and the replacements are the newer version that last (they fixed the problem.) If it is the guides replacing the seals won't last forever, however you could replace a lot of seals for the price of replacing the guides.

You could also use a thicker oil, 20w50 is the thickest speced for that engine.

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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)