My SDs always read low after starting then stopping and checking the oil. I drain for a long time when doing an oil change. When refilling, I'll leave a 1/2 quart extra in the jug, drive the car then top off the next morning.

I schedule an oil change before winter sets in so that it will last until Spring. Full synthetic lets the engine spin fast enough to start reliably in the winter.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.