Oil temperature and my oil's limits

[dparm]

I am interested in learning more about the temperature limits of my motor oil.

The car is a 2005 Audi S4. It's a small car with a monstrous 4.2L 40V V8 under the hood. The car has a 9.5 qt sump capacity. There is a primary radiator & aux radiator for the motor, and a third radiator that handles oil cooling. It's still a lot of motor in a tight space and this thing gets HOT.

I haven't catalogued any oil temps yet but I am curious what values I need to be nervous about. People around here seem to squawk at the 240+ readings from the newer BMW turbo motors. I wouldn't doubt this car is hitting the 240s under heavy load.

I run Motul 300V 5w40. Specs below:

Visc @ 40C: 72.7
Visc @ 100C: 13.32
VI: 187
Flash: 460 F
TBN: 8.3

For some reason the PDS actually says the viscosity grade is 10w40. Probably a typo?

 

[Steve S]

You have a great reason to run syn oil!!!

 

[simple_gifts]

Quote:

You have a great reason to run syn oil!!!

I lived to see this day.

 

[HangerHarley]

Originally Posted By: dparm
I am interested in learning more about the temperature limits of my motor oil.

The car is a 2005 Audi S4. It's a small car with a monstrous 4.2L 40V V8 under the hood. The car has a 9.5 qt sump capacity. There is a primary radiator & aux radiator for the motor, and a third radiator that handles oil cooling. It's still a lot of motor in a tight space and this thing gets HOT.

I haven't catalogued any oil temps yet but I am curious what values I need to be nervous about. People around here seem to squawk at the 240+ readings from the newer BMW turbo motors. I wouldn't doubt this car is hitting the 240s under heavy load.

I run Motul 300V 5w40. Specs below:

Visc @ 40C: 72.7
Visc @ 100C: 13.32
VI: 187
Flash: 460 F
TBN: 8.3

For some reason the PDS actually says the viscosity grade is 10w40. Probably a typo?


Pardon. But is this an RS4, or an S4? And the Mileage?

Id suspect your car had a FF of a Lubro-Moly of some type. I cant be sure.

You dont have an Oil Temp gauge, do you? Surely you have a Pressure gauge?

Also, how often you have changed the Oil will help. Even Filter type.

 

[dparm]

S4 (not direct inject), 58k. I use the OEM Mann filter and swap it with every change. That's every 5K.

No oil temp gauge, but the diagnostic tools (VAGCOM) can poll this on-the-fly. I haven't borrowed one yet to start this.

 

[HTSS_TR]

You need to plot the oil temps on a long trip with varying speeds to be able to know if your current Motul 5W40 is up to the task.

 

[CATERHAM]

Oil temps are interesting but oil pressure is what you really need to know. Of course having both is ideal.