What is so hard about it? On the 420sel I know I had to take off one of the heat shields from the exhaust manifold, and use a couple different extensions, but other than that it was a snap.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual