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Since it's available through coding, but showing zero, I feel like it's looking for a specific CAN message. Engine oil temp is being broadcasted in PT-CAN in my 2014 M235i. Maybe we can find what CAN ID the cluster is looking for, and make an emulator. I remember there were some successful efforts in hacking the E90 cluster CAN IDs..
Maybe the first thing to try would be to broadcast the 1D0 engine status (oil temp+others) message of E90 and see what our cluster thinks about it. F22 M235i DME doesn't send that. Maybe BMW transitioned the DME message types and didn't bother to fully transition the cluster.
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