I always use a torque wrench. You definetly don't want to over tighten the drainplug. I don't want a cracked oil pan. I forget what the foot pounds are for the drainplug, but I believe the filter cover bolts are 13 ft lbs. The torque wrench I have is a Craftsman breakaway torque wrench. It's good up to 75 ft lbs. I paid about $60 for it.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member