Hey Pelican,
While I don't have HFCs, my understanding is that the hiss is inevitable. I'll let someone more technically savvy explain it better.
In terms of the oil temp, I've been in the 220 range before. Limp mode kicks in at around 280 I think? I don't think 240 is anything to be concerned about, but again I'm not up on the details of the oil temp thing.
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT
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