So in the last 9 days we have experienced a 54 degree Celsius temp swing. From -50 to +4. What kind of affect does that have on oil sitting in a sump? Got to be some condensation I would think Didnt even attemp to start the car as I never had the block heater plugged in. The hemi work truck with bulk 5w20 castrol gtx started every morning but didnt sound good. The f150 ecoboost with with PP fired up like it was summer time, but would cover the entire street in exhaust