Hey all,
I've been dealing with this issue for the last couple of months. My 2002 S430 is loosing ATF and I can't locate the leak. I service my 722.6 regularly every 50 K miles without any problems. I replace the fluid, filter, pan gasket and 13 pin connector every "service". Lately I noticed a consistent loss of fluid, When I first noticed it was time to service the transmission and so I did, It was completely dry underneath the car without any visual signs of external leaks. I serviced the transmission and kept track of the fluid level, The service was done 3 weeks ago, and the fluid level was at the blue mark, today it is at the red mark. I checked the coolant - no oil contamination.

Any input?

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How full is the transmission module?

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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

Why would it be full if the pilot bushing (13 pin connector) is completely dry once disconnected?

Have you checked you coolant? A leak in the transmission cooler would allow fluid an coolant to mix.

Trans cooler's in the radiator are stupid any way.I always use a external cooler,I buy online.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran