Xtool a30m

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I've heard that either Torque Pro and/or Dash Command can read transmission temp with the purchase of an additional PID. For GM vehicles at least, don't know about MB.
Is there another method to do gearbox service without diag tool?
So I have a cheap ir monitor of this sort but always been a bit unsure as I don't want to harm the tranny through lack of correct tools. But I agree this would be an alternative.
I'd research where MB measure the temp and if it is at a location en-route to cooler (even if not at thermostat opening temp) then I'd think twice about using oil in the pan as a representative temp of the fluid circulating.

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