Just create a custom PID of Long Name of whatever you want to call it. – Let’s say “Estimated Oil Temp”, and leave the Mode/PID blank. Looks like you would need another custom pid averaging RPM, and you would need to get ‘run time’ from somewhere.

After all that, I’m not sure you would have a very reliable estimate. Instead of Time-RPM, Wouldn’t engine load, if available – or vacuum or MAF or CHT improve the estimate?

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I have not actually used the ‘Ravg’ function myself yet – but otherwise your formula looks correct to me. You can slap a gauge up on a screen and watch it to verify it.

If it does provide the average your looking for, you can use that result in any other PID formula you wish by using Val{Long Name} , referring to it by its proper Long Name – spelled EXACTLY the same as you have keyed it in. (Has to be EXACT, upper / lower case, spaces, everything). And those are braces in the ‘Val’ function, not parenthesis or brackets.

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You might get better results using
TAVG(seconds:value) or
AVG(samplesize:value).

RAVG averages everything until it
is reset.