Just curious....what's the purpose of cooler-running thermostats (the 70C one you mention and the 60C one you use)? Is it to compensate for some other part of the system that is defective? Or does it have a legitimate use in a properly running system? Thanks.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife