I totally agree.

Be sure to have your car raised in a safe way, because the plugs can be very tight! Change the oil only when hot. I change the oil every 100.000km (60.000 miles).
Clean the area around the plugs first to avoid sand falling in the rear diff.

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)