Per the Bentley manual you can just a little motor oil on the spark plug tubes/O-rings when you put them in, you don't need the super $$$ lube. That's what I did and it was fine. Solved my oil drip/weep problem too.
I have heard good things about the Conti DW. Sumitomo has a $50 rebate on a set of 4 tires, the HTR Z III is a good budget summer tire, I just finished up with a set of those in 17"s 9and the set of 4 is in the $350'ish range on tire rack with the rebate now), were happy with them, including several track days and autocross. (I moved up to a more extreme tire for next time but if I wasn't doing track I would have probably gotten another set; they wear really well for a max performance summer tire.
Good luck! There is lots of fun to be had driving and working on these cars!
Steve
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