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On Cummins the oil cooler /herter is between the pump and filter. Inside the block right next to the block heater. There is no bypass on the heater/ cooler. There is a pressure bypass that bypasses the filter when the pressure is too high, from excessive viscosity restricting the flow through the filter, or a dirty filter.
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The oil pan transmits heat to the oil from the block,I'll be it minimal. Otherwise the coolent based blockheater would not improve cold starting by reducing the viscosity enough to allow crainking. But I want more....to ease starting and improve MPG.
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1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20
Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg
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