Re: Oil Changes
I like to check the oil when I'm buying gas since it's level and the engine is warm. There will be some oil retention in the upper galleries, under the valve covers, ect so warm measurement is the best indicator.
With that said, you really shouldn't have a situation where the oil is retained anywhere in the return areas unless there is excess sludge build-up. The lifter valley, upper cylinder head areas, and internal block low pressure pathways all retain some oil as it drains downward towards the pan, but hot and cold readings should still be within safe levels is you're using the right viscosity for the local climate.
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