I will embark on my first DIY oil change on my '90 190E. The steps are simple enough: drain oil, remove old filter, install new filter, put drain plug back in, pour in new oil. Simple.

Some questions I have:

1. Do I need an oil wrench to remove the old filter? I got a Mahle oil filter. Is this a hand-screw filter or do I need a special oil wrench, as the top of the filter seems to suggest?

2. I take it that the oil drain plug is the bolt on the driverside bottom SIDE of the oil pan and not at the bottom.

3. How many qts for a six cylinder? (My indie normally states 6.5 to 7 qts in the invoice, recalling from the top of my head.)

4. The controversial question: oil change when engine is stoone code or after a good drive?

Thanks.