That discussion has been going on for years over there I think…guys have some strong opinions about lower tstats. I think I understand all the opinions, and frankly I swapped on in mostly out of curiosity. So far I am a fan, if only from the peace of mind that comes with lower system pressures.

I’ve had mine in for over a year perhaps and some brutal summer temps here in New Orleans and have had no problems. No codes thrown and I’ve never seen the MAP cooling activate with it in. I occasionally hook my foxwell up and keep an eye on it. It holds the engine outlet to 95 degrees in my car, and the radiator outlet temps can be 10 or 15 degrees hotter under heavy acceleration, etc. it seems from what I recall they were with the stock tstat. But that’s purely anecdotal. I also see a direct reduction in oil temps of around 15 degrees.

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Current
Original owner 2002 E53 X5 4.4i to 4.6i swap
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