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I've not ever used a torque wrench when I change my oil. I tighten the drain plug with a standard box end wrench and get it just a bit more tight than snug. There is a compressible gasket, so you don't need a lot of torque. On the other hand, you don't want it vibrating loose either. I'm sure someone uses a torque wrench and they'll have the exact spec, but I've never worried about getting it that exact.
I tighten mine with a 6-8" handled socket-wrench or end-wrench. I get it finger tight, then put a little squeeze on it, and it's good.
Hint: It will always be tighter coming off than going on, unless you really REALLY! limp-wristed it, and then it won't matter because the engine will be replaced anyhow.
I change oil/filter almost monthly (for track use) and I think I've only used a torque wrench on the drain plug once. I believe the specs are:
Oil pan drain plug: 18 lb ft
Engine oil filter: 22 lb ft
The last time a shop changed my oil (I think I had them do it when the car was in for something else), when I changed the oil the next time I found the drain plug so loose I could turn it with my fingers. It could have been disastrous. Torque wrench or not make sure the plug is on tight.
Blue and White torque. As you tighten your face turns blue and your fingers turn white, "your done". Really don't over tighten, pull snug then just a little more. 18 ft lb seems overly tight about 10 ft lb should be enough. I have seen a lot of stripped oil drains, there even is a plug that taps its own threads when installed.