Civdiv99,

Here’s a typical result from my Range Rover (M62 engine, ZF5HP24 transmission, same cooling system as E53). 110 deg.C. = 230 deg. F.

Clearly the fact that the electric thermostat on the engine operates the engine cooling system at such high temperatures in an attempt to eke out the last bit of fuel economy at part load doesn’t exactly help with the transmission fluid ‘cooling’ (or is that heating?)



Phil