Since I changed the theromstat on my 350SDL, it runs consistantly just slightly above 80 C.

On hot days, just add a few degrees, but not much.

before I chenge the thermostat, it ran cold, always under 80C

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Providence, RI
Current Fleet:
1991 MB 350 SDL running 2 tank Frybrid Waste Vegetable Oil
2005 Toyota Prius
1997 40' Bluebird Wanderlodge motorhome running running world's first 3 tank Frybrid Waste Vegetable Oil