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I can't answer your Q directly, but I have an NGK WB unit, with a Bosch sensor. I have avoided Avgas because I was told it kills the sensor in a few hrs. I have had the same sensor for the last 17 yrs. However, at a track meet a week or so ago another 911 driver told me they are tolerant to Avgas. He is a 911 tech, runs a 911 business, and has WBO2 in his 76 911, and runs Avgas. So they may be more tolerant than we think. You would also think the heat of the exhaust (900 Deg C?) would cook any oil residue off the sensor, although it may be erroneous with the oil passing over it at the time?
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
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