I have never had a temp problem when using the Mityvac on an oil change. If you use the plastic tubing, it seems the tubing starts to soften up and cave in a little bit reducing the flow of hot oil out of the engine. After a ten minute drive, the oil temp on the M10 does not seem to get an warmer than 160F, I have never had a problem with changing it while doing that.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record