When I did my cylinder head I found that someone previously had broken a portion of the rail that holds the upper timing cover "worm" seal. Needless to say when I buttoned it up that seal leaked oil like there was pressure behind it. I pulled it back apart, **** canned the seal and ran a fat bead of the black MB sealer. Well that was about 10k ago and it hasn't leaked any at all...none. Don't think I'm gonna ever use another worm seal again on my own engine.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff