The Mobil 1 15w50 seems to get up to pressure pretty quick except for a couple unheated single digit starts. I could feel the drag that time, I try to use the heater for almost an hour if it is in the teens out or a little longer if colder.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k