I was always taught that plugs with parallel threads used a crush washer (like the oil pan drain plug) and that plugs with tapered threads used sealant (teflon tape, pipe dope, etc.). Today, when I drained my '85's differential (yes, I removed the fill plug first), I discovered that the fill plug, which has parallel threads, had no crush washer. It didn't leak, either. Phil doesn't list one in his inventory. Is there such a thing? What do you have in yours?

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970