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I got a stat from the dealer a while back for the 940 (B230FD), and they handed me a 92C Wahler - with "Volvo" stamped into the rim.
In my 83 240 with a true temperature gauge, I see a little less than a needle's width difference between the 87 and 92 stats at full operating temp. In the family fleet, all red blocks run the 92.
Benefits? in general the hotter stat should give a bit better efficiency in terms of fuel economy and emissions. It also should 'burn off' condensation inside the engine a bit faster and more completely, and this could be important if frequent short trips are a part of the car's usage pattern.
I doubt the 92C stat would bring greater risk of overheating, as a properly sealed cooling system with 50/50 antifreeze won't boil until about 125C with the 150kPa 940 reservoir cap. (In the GM factory books for my LT-1 powered 740, the electric fans' low-speed trip is at 108C and the high-speed point is 113C)
In my 1989 740 owner's manual, the stats are specified as 92C for Turbo, and 87C for non-turbo cars. Intuitively, that seems backwards. Misprint?
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Bob (son's 81-244GL B21F-M46, dtr's 94-940 B230FD, my 83-244DL B23F-M46, 89-745(LT1 V8), 98-S90, 77MGB and four old motorcycles)
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