They also come off a lot easier when the engine is at operating temperature, the Diesel fuel won't burn you. When you yank it off wear safety goggles! I've had diesel splash right on my lens.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.