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Today was 80 degrees out and on the freeway doing 75 mph for 20 miles oil temp was 217, water temp was 187.
I live in Southern California also, and these numbers are also what I have typically seen.
Another data point I can add is that I drove out to the desert (Palm Springs) a few weeks ago where it was over 100 outside and while on the freeway, the oil temp got up to a hot 248! After that, I had a 180 thermostat installed and also upgraded my radiator to a larger one (A&A Custom). The stock radiator is a mere 1 inch thick.
Okay so it's common for it to be around 220* just cruising. What about road course temps?
It depends on how hard you drive. As Bill mentions, you can easily push 300+ without a cooler and driving aggressively on good tires. Before I installed my external oil cooler I would monitor my oil temps and back off when the oil temps exceeded 280. Once the oil temps dropped back down into the 260s I'd go again.
After my EOC, I can run a full session now without the temps getting much above 270, even here in TX.
Mine runs right at 216. I put in a 160 degree thermostat and had the fans turned down to come on at 180. The collant runs right at 174 on the highway, never over 190 in stop and go. but the oil stays at 216. I am looking into putting an external oil coller on mine
On a typical 82* summer day, my coolant temps stay between 194* and 198* no matter what. My oil temps average at 222* cruising at 70 mph on the freeway. On my last hard run through the mountains my oil went to 236* From what I understand this is normal. Funny thing is that my A4 tranny oil doesn't ever exceed 165*!
23X running on the street in the 97' at any outside temp....
32X at the end of a 25 minute session of 3.27 mile road race.......(heavy foot and far from stock with an iron 6.0L block)
Change the oil after a 2 day event..........have a nice day
The 00 coupe/vert is 215 crusing & 250 max pushing them on a road course in 80 deg weather
105 deg at VIR yesterday - mine got to 267 once after a 20 min on track. Most of time it stayed around 250. Coolant only got to 237, and all this is with a supercharger with heat index abouve 110. It was really hot. It is about the best I could ask for.
My heads/cammed engine ran at 205 all the time with mobil 1 synthetic. I currently have Rotella 15W40 in my 383 LS6 for break in purposes and it likes to run in the 215-220 range, although on cooler evenings it seems to stay around 208.
was running at 230's stock 1999 FRC in not that hot, hiway drive. 240's when ******* it. Was driving me nuts. SO I did:
1.) Opened up the stupid fog light ducts, put in Z06 screen = more air
2.) callaway honker cold air intake
3.) changed the MAF housing to a no filter screem / honey comb polymer composit to cut down on heat sink
4.) 160 degree lingenfelter thermostat
5.) RP Oil 10w-30, will switch to 5w-30 only when it gets clsoe to freezing temps again in the late fall
6.) reprogram the fans to come on MUCH earlier
Now hiway driving I get a max of about 205 oil temp and about 180's for water temp, and thats when ******* it :-P Why do an oil cooler unless you are dragging...