In most scan tool procedures that call for "operating temp" they consider 150F oil temps or above to be operating temp. The warmup lights go away on my veloster N when the oil reaches 150 degrees. They warn not to use high engine speeds till those lights go away, so I would assume that means oil...
I did something similar years ago testing a fuel pump relay. Turns out a shorted out fuel pump draws enough juice to make a paper clip glow like a light bulb. Not great when you're holding the paper clip between your fingers.
To be clear, this is a dry filter, not an oiled one.
I do live where there's a lot of agricultural dust and dust from coal mining. They also gravel the roads heavily in winter and that stays around all year making dust. I park the car in a gravel lot when I take it to work. So I would say...
I'm running a 4" inlet conical AEM dryflow on the custom single turbo system on my Supra for the past 3,000 miles or so and I found a light coating of very fine dirt in the entire intake tract from the filter to the manifold. It's enough that I immediately noticed it when I pulled the...