An oil leak is an oil leak and even just one of those plugs being out would constitute an unacceptable loss of oil pressure to me. I probably take more shortcuts than anyone around here but even I wouldn't take that one. They may in fact still be OK but those things have a pretty bad track record so I wouldn't wait. I'll tell you what I'm gonna do with my 95 E420: I'm already watching the U-Pull-Its and when a 92 M-119 shows up, I'm gonna pull all 16 tubes and install them in my 95. Just make sure it's not one of those Cash4clunkers cars cause they've had that evil sodium silicate solution run through their engines which of course means those tubes would be contaminated with the stuff.

Try to get an oil that is NOT the newer "SM" standard. Try to get one that is the older "SL" standard instead. All the "SM"s say they also meet "SL", but they are NOT the same and they are NOT as good. They have reduced levels of ZDDP (zinc phosphate). I've noticed that Royal Purple synthetic is still "SL" but you better check to be sure. I'm running some old Amsoil that I have a stash of that is "SL" but I don't know if their new stuff still is. Also, don't go too thin, I wouldn't go any thinner than 10W-40.

Spark plug wires are a very overlooked part on these cars. People mistakenly think they last forever. They don't. Both my 93 400E and my 95 E420 had very bad, arcing, spark plug wires when I bought them.
Regards, Eric

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89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.