6.4L Temperature Maximums - Dodge Challenger Forum: Challenger & SRT8 Forums
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post #1 of 11 (permalink) Old 06-10-2019, 09:31 AM Thread Starter
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6.4L Temperature Maximums

I occasionally do HPDE road course track events at Road Atlanta. Last time I went, I noticed my oil temp got up into the 270's (approx as I'm going off of memory). I run Amsoil synthetic and change it before my events. However, it concerns me a bit that it got that high. We run 20 minute sessions and sometimes I may have a chance to run back to back with a small break in between. The weather Temps will be much higher this time.

What is the temp maximums for the following?

6.4L - oil temp
A8 - tyranny temp

I have another session this weekend and will be tracking/documenting it.
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post #2 of 11 (permalink) Old 06-10-2019, 09:44 AM
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Quote:
Originally Posted by Janson View Post
I occasionally do HPDE road course track events at Road Atlanta. Last time I went, I noticed my oil temp got up into the 270's (approx as I'm going off of memory). I run Amsoil synthetic and change it before my events. However, it concerns me a bit that it got that high. We run 20 minute sessions and sometimes I may have a chance to run back to back with a small break in between. The weather Temps will be much higher this time.

What is the temp maximums for the following?

6.4L - oil temp
A8 - tyranny temp

I have another session this weekend and will be tracking/documenting it.
not sure what maximum is, however we were seeing oil temps reaching 280+ last year, in my opinion much too high, two oil coolers added for this year, no idea on transmission, but would seriously consider adding a transmission cooler, be careful with the A8, it needs a certain amount of heat to function properly
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post #3 of 11 (permalink) Old 06-10-2019, 09:48 AM
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post #4 of 11 (permalink) Old 06-10-2019, 10:12 AM
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I have hit 290 once(repeated WOTs racing up a mountain at 9-10,000 feet so pretty thin air), I've read that Mobil 1 can go over 300 degrees without issue, would assume it's the same for most other oils. Car performed without issue for what it's worth...

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post #5 of 11 (permalink) Old 06-10-2019, 10:28 AM
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would not recommend anything above 280, it may be ok for a while, but not for repeated use, sooner or later will fail

highly recommend modifying for repeated use, under sustain full power we were are seeing temperatures above 250/260, at which point we where pulling off track

significant modifications have been performed, including new Fluidyne radiator, 2 fans, one pulling and one pushing....

2 oil coolers and 2 heat exchangers for the supercharger

Luke

ps under full power we consume fuel at approx 3 to 4 mpg
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post #6 of 11 (permalink) Old 06-10-2019, 11:01 AM
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According to a white paper on thermal breakdown of engine oil that I cannot find at the moment to include a link to, SN rated conventional starts to breakdown at approximately 275F, and synthetic will start around 300F, though different synthetic oils will have different breakdown temps. Amsoil's synthetic probably comes in higher than most, but that's no more than an educated guess on my part.

I'll keep looking for the source of that info and update my post with a link to it if I can find it.

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post #7 of 11 (permalink) Old 06-10-2019, 11:38 AM
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I remember oil temps in a BMW M-Coupe on track days being 265F. I haven't done any track days with my TA392 but around 260F seems pretty common for a track event in any factory car from my memory. I'm not sure I'd worry about it much unless its 275+. But I would absolutely shorten my oil change interval directly proportionate to the oil temps. The higher the temps and the more often the higher temps, the sooner the change. If I tracked my car a lot I'd probably do an oil change at 3000 or less and right after any track event where it was 280+. That's just my opinion though.

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post #8 of 11 (permalink) Old 06-11-2019, 02:09 AM
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Sequence IIIG Engine Test

Quote:
The Sequence IIIG Engine Test is designed to evaluate automotive engine oils for high-temperature performance, including oil thickening, piston deposits, oil consumption and engine wear during moderately high-speed, high-temperature service. Testing is performed using a 3.8L General Motors V6 engine that operates at 126 hp and 3,600 rpm. Motor oil temperature during the test reaches a steady 302ºF. As a comparison, the typical engine temperature of a passenger car/light truck is approximately 200ºF.
But as Luke advises, you'd not want to do prolonged use at those temps.

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post #9 of 11 (permalink) Old 06-11-2019, 05:06 AM
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A high temp alert (CEL) for the A8 transmission will come on when the temp hits 278 degrees.
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post #10 of 11 (permalink) Old 06-11-2019, 08:02 AM
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Tracked my car regularly. Always used Mobil1. Never saw it go above 260* even in the 100* plus temps in CA. I had a custom tune with 180* stat. I’m sure it helped.
I’d also highly recommend changing the oil after each track event. FWIW, I was averaging about 5 mpg. I’d have to fill up on most track events by mid day
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