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Not sure if the 500 uses a 19mm "bolt" or the 6mm allen plug. My 4.5 has the larger "bolt" type plugs while the 560 has the allen plugs. On either car I put the socket on a long extension then seat the socket using the extension. No need to snake your hand all the way up there. If yours has the allen plugs be sure the allen is fully seated, the allen will strip out easily. Also, once the plugs are out you may find that nothing comes out, that is because of the crust layer that gets deposited. You simply poke through it with a small screwdriver and the coolant will flow out.
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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP 
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.
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