Hey thanks so far for the opinions.

I did use chevron techron fuel treatment recently.

I also observed the engine running in the dark in order to spot any insulation gaps (sparks) at the boot ends attached to plugs.
none.

What's the best tool/strategy for the lower hex bolt on the dist. cap?

THX

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD