Cautionary note about variable redline
#1
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Cautionary note about variable redline
Note that it appears the redline moves up when the *COOLANT* temperature reaches normal, not the *OIL* temperature! Starting out on a warm day, coolant hits normal within a half-mile, but oil is still sitting at 150 degF (my normal seems to be 210-214 degF) and the redline is already moved up to the normal position.
Personally I like the *OIL* to be warm to consider the engine warmed up, but apparently the factory doesn't agree. Consider yourself informed
Personally I like the *OIL* to be warm to consider the engine warmed up, but apparently the factory doesn't agree. Consider yourself informed
#3
AudiWorld Super User
What does the user manual say for the S6? The RS5 manual says oil operating temperature is reached at 140 degF, even though it will continue to climb until around 200 to 210 or even higher depending on how I drive, but according to the user manual once the oil reaches 140 degF the engine is ready to go.
#4
I've always wondered what deciding factor(s) were behind the redline change. I thought I just read that it was based on oil temperature, but I guess not! Strange, because I've come back to my car after it's been sitting a short while to find the coolant temp still at 4 bars, while the redline is down to 5400 and vice versa where I've had the coolant temperature at 2 bars and the redline was still at 6400.
Starting to think it's voodoo.
Starting to think it's voodoo.
#6
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#7
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On the S6 my oil temp starts to register around 140-ish. I usually look for >160 before I use any heavy throttle.
On my stg3 B5S4 my threshold was >175F and the K04s never had any issues.
On my stg3 B5S4 my threshold was >175F and the K04s never had any issues.
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#8
AudiWorld Super User
Good advice. I take it easy for the first 15-25 minutes (light throttle) so all the engine components equalize. Never had a head gasket blow even with engines where it was a known weakness (iron block with aluminum heads).
#9
AudiWorld Super User
I've always wondered what deciding factor(s) were behind the redline change. I thought I just read that it was based on oil temperature, but I guess not! Strange, because I've come back to my car after it's been sitting a short while to find the coolant temp still at 4 bars, while the redline is down to 5400 and vice versa where I've had the coolant temperature at 2 bars and the redline was still at 6400.
Starting to think it's voodoo.
Starting to think it's voodoo.
#10
AudiWorld Senior Member
^^^ My philosophy is a little different: The metal bits, which expand at different rates, are still stabilizing, even when the coolant is long up to temp. I figure if the oil is still getting warmer, the block (which can hardly have a worse heat capacity) is too. Hence, no fun until the oil is warm (85-95C, depending upon ambient temps).