Over the weekend:
Dumped a bottle of K100 fuel stabilizer into the Camaro and MGB, ran them bot for a half hour or so.
Washed, waxed and detailed the engine bay of the SLK - there's a Benz show & shine in Milton on the 16th that I think I am going to go to (I've never been to an Benz club event).
A/C charge had leaked out of the Sonoma again. I don't know where it's leaking, so this time I recharged it with some dye. I found one of the big connections at the acumulator a little loose, got about 3/4 of a turn out of it. Got it running nice and cold again (for now) and leak checked all the accessible connections with soapy water, all good. No sign of the dye anywhere yet either. So now I am not sure whether that one connection was my problem, or whether my leak is just well hidden. Frustrating, if I could figure out where the leak is(was?) I'd gladly replace/refresh the whole system