Wildly fluctuating oil temps

[audiSean]

How about:
a coolant flush and fill with a check of the system? 
searching for the sensor which monitors the oil temp and swapping it out?

On 4/19/05, Andrew Duane <andrew at savaje.com> wrote:
> Recently, my 2000 A6Q2.8 has started showing a deeply troubling symptom.
> Sometimes, the oil temp will be rock steady at just shy of 225 degrees.
> Sometimes, though, it will start fluctuating up and down pretty quickly.
> The swing can be as little as 10-20 degrees, or as much as 50-75 degrees!
> Needless to say, watching the oil temp go from 225 to 300 in 15 seconds,
> wiggle a bit, then drop back down to 225 is unsettling.
> 
> When it climbs, it does so at about the same rate as it climbs when getting
> up to temperature, so I do think it is actually getting that hot. The oil
> in place is a fresh fill of Castrol GTX, some 5W30 and some 5W40 (both
> approved weights).
> 
> --
> 
> Andrew Duane            Member Technical Staff - SPG
> SavaJe Technologies     andrew at savaje.com
> 100 Apollo Drive        p: 978.856.4943
> Chelmsford, MA 01824    f: 978.256.8386
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-- 
Sean [99 A6 2.8q]
http://registry.audiworld.com/audiworld/registry/details.asp?car=9728