I've installed the NPG+ coolant in our 1999 Subaru Outback Ltd. When temps are at 25F, engine coolant temp seems to get to operating temp in 2/3 time or miles traveled. Heater comes up much quicker. Car seems quieter. At operating temp - no difference in temperature. I'll be checking gas mileage over the next few months. I am still waiting for our 100F+ summer to see about engine temp with AC at speed and at idle in trafffic. Probably will change our C230 at next service.

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Roger
1983 300CD 246k sold
1998 C230 52k
1980 450SL 75k needs AC
1999 Subaru Outback Ltd 43k