It would be very nice correction for CVVTi pulleys in use with high viscosity oil. On some engines that were using something like 0W or 5W as oem specification and now 10W~20W; before oil reaches >60*C, there is great haunting to target, thus lambda and emissions are terrible. For example Multiair/Starjet, 4B11T, G4KF, S54 have oil temperature sensor in oil passage of cylinder head and they correct maps according to oil temp:-)
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