Normal oil and coolant temperatures
Re: Normal oil and coolant temperatures
No
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Normal oil and coolant temperatures
Oil temp is available in group 134, ECU.
Also in instrument cluster, group 50.
Also in instrument cluster, group 50.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Normal oil and coolant temperatures
Amazing thank you so much. VCDS on order. Will investigate and report back
Re: Normal oil and coolant temperatures
So - interesting development. I have gone for a spirited drive this evening and given it the full beans. Gauge indicating 90C coolant and 120C engine oil.
Half way through the drive the engine oil gauge dropped swiftly to 90c.
I then drove around town at a leisurely pace to see if it would increase again. It did not. Stayed at 90C on both gauges.
When I turned the engine off the afterruns fans didn’t even start up and subjectively the heat coming from the engine bay did seem less hot.
Do you think I have a sticky thermostat? And the spirited drive increased the oil pressure enough to unstick it?
Half way through the drive the engine oil gauge dropped swiftly to 90c.
I then drove around town at a leisurely pace to see if it would increase again. It did not. Stayed at 90C on both gauges.
When I turned the engine off the afterruns fans didn’t even start up and subjectively the heat coming from the engine bay did seem less hot.
Do you think I have a sticky thermostat? And the spirited drive increased the oil pressure enough to unstick it?
Re: Normal oil and coolant temperatures
Went for another enthusiastic drive this morning and oil temp is stuck on 120…… any theories?
Re: Normal oil and coolant temperatures
FWIW standard coolant temp on the dashboard always stays at 90 here and on VCDS I get a stable 98°C when engine hot.
For the oil temp, on the dashboard it depends on the driving, but never goes above 110 here. For peace of mind I would replace the oil temp sensor (can't remember if it's easy to access though). If it stays high, you may have a clogged oil cooler (the one at the front which also serves to cool transmission oil).
For the oil temp, on the dashboard it depends on the driving, but never goes above 110 here. For peace of mind I would replace the oil temp sensor (can't remember if it's easy to access though). If it stays high, you may have a clogged oil cooler (the one at the front which also serves to cool transmission oil).
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Normal oil and coolant temperatures
Yeah, I took mine for a spirited test drive the other day after replacing the rear caliper and the oil temps went up to 110 and the ambient temperature was 38 degrees. If you’re seeing 120 then I’d be looking for a thermostat issue.
Did you measure the coolant temps when your oil was at 120?
Did you measure the coolant temps when your oil was at 120?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Normal oil and coolant temperatures
just went to poland 3 weeks ago 1200miles one way,oil max 105 when did 180mph for few minuites, collant 108,valvo 5w50 changed just the day i left uk,before had valvo 5w40 and temps still same,when diving max 100mhp constant oil 90' collant no more than 100'
Re: Normal oil and coolant temperatures
Coolant was about 95C.
I’m getting the thermostat and water pump replaced tomorrow (cam belt service). Fingers crossed. Il report back
I’m getting the thermostat and water pump replaced tomorrow (cam belt service). Fingers crossed. Il report back
Re: Normal oil and coolant temperatures
So little update.
Cambelt service with new thermostat, water pump, radiator hasn’t solved my oil temperature. (Glad I did it though, there was a leak on the radiator and water pump) Coolant runs at 90, oil temp still at 120 as before.
Mechanic thinks it’s within normal petrol engine tolerance and the oil temp sensor would throw a warning light if it was too hot. I’m still not convinced though, with most people reporting lower temps.
Would engine oil make any difference? Having bought the car 3 months ago, I have no idea what they put in there in the last service. Could this affect oil temps? For example they may have used 5w30 instead of Audi spec 5w40. Or am I barking up the wrong tree? Should I stop being paranoid? lol
Cambelt service with new thermostat, water pump, radiator hasn’t solved my oil temperature. (Glad I did it though, there was a leak on the radiator and water pump) Coolant runs at 90, oil temp still at 120 as before.
Mechanic thinks it’s within normal petrol engine tolerance and the oil temp sensor would throw a warning light if it was too hot. I’m still not convinced though, with most people reporting lower temps.
Would engine oil make any difference? Having bought the car 3 months ago, I have no idea what they put in there in the last service. Could this affect oil temps? For example they may have used 5w30 instead of Audi spec 5w40. Or am I barking up the wrong tree? Should I stop being paranoid? lol
Re: Normal oil and coolant temperatures
What’s your ATF temperature when your oil is at 120?
I don’t believe there is a DTC or MIL for excessive oil temp.
I don’t believe there is a DTC or MIL for excessive oil temp.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Normal oil and coolant temperatures
120C for oil isn't the end of the world - my little MG TF frequently sees that.
But it's a bit warm and won't do the oil any favours - plus you'll likely have some hotspots where the oil is well above that. 80-90 is about perfect.
Your RS should, IMVHO, certainly have a normal oil temp of about 90 - and if it doesn't something is up. Can't remember all the oil plumbing off the top of my head though - is the thermostat in the unit bolted to the side of the block where the bufkin pipe goes?
If the car is new to you, I'd see if the cooler pipes are actually connected. The pipes & unions started failing when the cars were about 10 years old - and possibly someone has just bypassed them rather than replaced.
Stick one of these on your oil filter and this'll tell you whether it's a sensor issue, or real issue:
https://uk.rs-online.com/web/p/temperat ... ls/7799772
But it's a bit warm and won't do the oil any favours - plus you'll likely have some hotspots where the oil is well above that. 80-90 is about perfect.
Your RS should, IMVHO, certainly have a normal oil temp of about 90 - and if it doesn't something is up. Can't remember all the oil plumbing off the top of my head though - is the thermostat in the unit bolted to the side of the block where the bufkin pipe goes?
If the car is new to you, I'd see if the cooler pipes are actually connected. The pipes & unions started failing when the cars were about 10 years old - and possibly someone has just bypassed them rather than replaced.
Stick one of these on your oil filter and this'll tell you whether it's a sensor issue, or real issue:
https://uk.rs-online.com/web/p/temperat ... ls/7799772
"not a professional engineer, mechanic and mechanist"
Re: Normal oil and coolant temperatures
I would replace the oil thermostat. If it's not available separately, then get a whole new cooler. I bought one for my Golf once. Not very expensive:
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Normal oil and coolant temperatures
Agreed. And looks very accessible - it might fall into that small subsection of the workshop manual that does not start with "Remove Engine".
"not a professional engineer, mechanic and mechanist"
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steve2003rs6
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Re: Normal oil and coolant temperatures
The large seal had gone really hard over time. Took ages to persuade it out with a hammer and appropriate screwdriver. Eventually came out a small bit at a time. Thankfully lee had a spare seal.
Last edited by steve2003rs6 on Fri Oct 20, 2023 7:23 pm, edited 2 times in total.
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