oil temp o4 coupe
Race Director
Joined: May 2001
Posts: 15,324
Likes: 2,080
From: Guelph, Ontario
I just picked up my car today and it was 70 degrees all day and in normal driving I noticed my coolant temp was at 187 on the highway, and around 190-200 the rest of the time. My oil temp was mostly in the 180-200 range, although it hit 212 at one point. I think my car might have a colder thermostat in it though. The stock one for a 98 is supposed to be a 187 unit, but that should put my coolant temps closer to 205 on the highway I would think.
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Normal, especially in city driving in hot weather.
The stock t-stat opens starts to open at about 188 degrees so that will normally be the low end of coolant temp. The fans are controlled something like:
First stage fan "on" temp: 229
First stage fan "off" temp: 222
Second stage fan "on" temp: 239
Second stage fan "off" temp: 230
So if you are moving and air is flowing throug the radiator, temps should be between 190 and mid 220s. In stop and go traffic, the fans will likely control temps per the above. Note: running AC will have fans on and drive temps down in stop and go traffic.
With these coolant temps and no oil cooler, the oil will normally run hotter than the coolant. Oil temps to as high at the 240s in stop and go driving are normal. On the track, oil temps can easily reach 300 degrees without oil coolers.
The stock t-stat opens starts to open at about 188 degrees so that will normally be the low end of coolant temp. The fans are controlled something like:
First stage fan "on" temp: 229
First stage fan "off" temp: 222
Second stage fan "on" temp: 239
Second stage fan "off" temp: 230
So if you are moving and air is flowing throug the radiator, temps should be between 190 and mid 220s. In stop and go traffic, the fans will likely control temps per the above. Note: running AC will have fans on and drive temps down in stop and go traffic.
With these coolant temps and no oil cooler, the oil will normally run hotter than the coolant. Oil temps to as high at the 240s in stop and go driving are normal. On the track, oil temps can easily reach 300 degrees without oil coolers.
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C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
Was always curious about that question 
