I put a quart of ATF in with the last tank, so far, so good

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1960 190D (college car), gone
1995 E300D, 325 k
2019 LEXUS UX 250h (spouse mobile)
2003 Nissan Frontier Crew Cab
2007 Jeep Grand Cherokee Overland 3.0L MB diesel, 185K
1978 GMC Classic Motor Home