Cold engines do not burn fuel effeciently. Engine braking just makes the engine rev w/out fueling. It could be burning the oil left on the sides of the cylinders. Going "back to normal" when at operating temp makes sense, as the engine oil is thinner, so the oil wipe ring does a better job.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D