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Old 04-18-2019, 06:04 PM
Russianblue Russianblue is offline
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Join Date: Jul 2010
Location: Charlotte, NC
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I have 2 3.0L Xers and the temp flux you describe is exactly what I see on the unlocked OBC temp on both. On the highway at a steady 80 mph, the temp will go to about 90-92 degrees then periodically trickle down to as low as 76. Then it will work it’s way back up, but usually only to the high 80s then back down to the low 80s. it’s obviously a closed loop feedback system. BUT The temp never settles at one number. seems to always be moving. suddenly back out to 83, then back to 76, then to 80, steady for a while, then drops again and back up again. personally I don’t understand the logic of a constantly variable temp (outside temp the same, speed the same), but I assume BMW knew what they were doing when they designed the DME software.
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2005 X5 3.0i - 71k mi (9.2018) -> 81k (9.19) -> 100k 9.21
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