For the record, I asked Harry on Facebook why some Android users were seeing oil temp, and I wasn't seeing this info on iOS. Here's his response:
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This is no Android / iOS item - both versions have the same OBD capabilities. Many cars do not provide oil temperature using the standard oil temp PID, but use some custom PIDs. Custom PIDs are not yet supported by LapTimer but scheduled for v21 or v22. In addition to this LapTimer capability, the custom PIDs for individual car models (like the FR-S) will be required. Car manufacturers keep this information secret.
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I followed up to see if this might be a difference in OBD2 devices, or Bluetooth vs. Wi-Fi, and Harry said:
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No, it is the car. For your FR-S the manufacturer decided to not map oil temperature to OBD II. From the list above you can see 015C is missing.
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I don't get why some of our cars show this info, and some don't. Maybe a difference in model year as far as how PIDs are sent via OBD2.
Oh, and Petrolhead will show oil temp on the timer screen if it's available. Grand Prix is the only version where you can overlay this info on a video though.