Search and read up on the MAP cooling function of the DME. The thermostat has a wax pellet in it that the DME can melt and open the thermostat more than under normal thermostat operation. It’s supposed to help balance the need for power, and fuel economy, pre-detonation, etc. because the motor runs so hot (I think), but it I can’t really understand it in actual operation, and I read it isn’t really necessary.

I watch the function in real time and it seems to activate after I’ve gone up the big hill, or passed the car on the highway, floored it up the on ramp, etc. - too late to help with power. On the other hand , I’m cruising on a flat highway at 75 and it activates every 3 to 5 minutes endlessly. Makes no sense.

As far as thermostats, I’ve gone through two in 20 years.

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Current
Original owner 2002 E53 X5 4.4i to 4.6i swap
2026 G80 M3 6 spd
2025 G06 X5 50e
Former
1972 Audi Fox
1986 Saab 900S
1996 BMW Z3
1998 BMW E36 M3 Sedan
2004 BMW E46 M3
2006 Audi A3 Quatro
1993 Mopar 318 Jeep Grand Cherokee
2015 V6 Jeep Grand Cherokee