Thanks guys.
It had the peformance chip when inspected and I did run it for 40 min with oil temp as high as I have seen it go.
A new DME relay was installed recently. Perhaps it could be responsible.
There is plenty of power and it definately doesnt 'limp home' so my guess is the oxygen sensor is connected, although I think it is original.
I am curious to feel the difference with the original chip and I think I may install it to see the ditterence.
At which point is a rich mixture a problem (bad for the engine) and how do you know you are at that point ?
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