You need a swivel joint, allen head socket, couple of long extensions and a breaker bar with cheater to do this job. Get the car up as high as you can safely and use brute force.

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1977 300D Lost coolant while someone else was driving
1983 300D Can't run without oil
1985 300SD (gone but not forgotten)
1990 300TE 4matic Sold
1991 Yamaha Venture
1975 Kawsaki 250 triple
1974 Honda 200CL
1951 8N Ford
2008 Wildfire 650C