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I have a 2018 M3 with 4200 miles and had the same
Issue. The car is garaged all year and is a weekend car, but live in NYC so left it on the BMW CTEK charger.
Similarly I would start car every weekend to warm it up and sometimes drive or wash it. Got the notorious clicking with the CEL light. Ended up needing a new valvetronic motor.
Now I don't use the CTEK to be safe and try to drive it more. Mechanic said the condensation within cause the motor to have a bit of rust
Ray
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