Sixto - Thanks for the help. Its a 420SEL, and you're right about the 27mm for turning the crankshaft.

I was also planning on buying a set of hex heads - what sizes do you use?

Does anyone have any experience with Harbor Frieght tools? (www.harborfrieght.com) They're very reasonable - compared to Craftsman.

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2003 S500 Black/Charcoal
1990 560SEL 61k Arctic White/Grey

SOLD:
1988 420SEL Black/Palomino Sold @ 85k
1987 420SEL Midnight Blue/Grey
1986 420SEL Diamond Blue/Grey
1983 380SEL Champagne/Palomino