Lately my temp gauge has seemed to show that my car is slow to warm up. It doesn't overheat it just take a while to get up to temp. Today after a short trip it was still reading 60c. It eventually reaches 80-90c. I felt the upper radiator hose and it was quite hot. I believe this indicates the thermostat is not closing all the way.

Second question: I am going to buy the Zerex G-05 for my C230. I figured I could also put it in the old truck (1988). However the bottle said this stuff is only for 1996 and newer vehicles. Could this possibly harm an old car/truck? Like maybe it is good for aluminum but bad for copper/brass?

Thanks,

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra