So it's heating up here in LA, so I thought I would try Red Line's Water Wetter.
http://www.redlineoil.com/products_coolant.asp
It claims to reduce the engine temp by 15-30 degrees, and low and behold it works! the temp stays just a RCH above 175 in downtown LA traffic.
I know this is a totally rare thing in a 164 S

but there's a nagging gas smell in the cabin. I had one bad gas smell fixed when I bought the car (mechanic replace a hose) then a year later a broken injector which perfumed the cabin when the climate control fan was on.
I tore apart the trunk, crawled underneath the best I could and everything was bone dry.
Any suggestions?