Date registered: Dec 2012
Vehicle: 2003 S430
Location: Georgia, USA
Mentioned: 101 Post(s)
Quoted: 386 Post(s)
As keyhole says, the fluid level must be checked at the proper temperature. In addition, the fluid level must be checked:
- With the car level, front-to-back and side-to-side.
- With engine running.
- After shifting slowly thru the gear positions.
- In PARK or NEUTRAL.
- Using the tool markings appropriate to the fluid temperature (either "cold" at comfortable ambient temp, or "hot" with the transmission fully warmed up - 80C is 176F, which is painful to touch).
In my case, only the red locking tab was broken, and the black cap has stayed on for several years with no problem.