Never on my car or the wife’s minivan. On the 240D its checked at every time the tank is filled so its on a level surface. Sometimes it meeds a quart about 2,800 sometimes none between changes.

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1981 240D Four on the floor, Orient Red over Parchment, bought with 154,000 but it's a daily driver and up to 180,000 miles, mostly original paint and all original interior.