I have been running 5W40 full synthetic on it, just serviced it though so we'll see if it makes a difference. Truck hasn't been plugged in yet this winter, it has been getting colder but anything below -10C I plug it in. Its not as bad once it warms up.
EGT issue is only when I'm pulling a hill loaded. Empty I couldn't even get close to 1200. Cruising on flat ground with a trailer usually sits at 800F, without trailer 600F. It does take a good hill to hit 1200F with a trailer behind.
Kronic
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2002 F350 CC/LB/SRW, 7.3 PSD, 6spd, 4x4, 6637 intake, IH up pipes, straight pipe, WW, FRX, HPX, CCV mod, EBV Exh. Brake, gauges
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