I use 20w-50 VR-1 Racing oil, and a Hamp Oil filter. I've heard many cases of Mobile 1 burning alot quicker in high compression motors such as mine, which is why I uses what I use.

 

4.3 quarts of 10w30 mobil 1 with the small filtech honda oil filter

 

5 or 6 quarts and yes i change my filter. I usually use castol or somthing

 

5 quarts of Royal Purple 5W20 and K&N oil filter..

 

I add about 2 quarts a month to the escort, and the 930 requires about 11 quarts per oil change.

 

4 gallons of rotella T in the current car


7 quarts of mobil 1 5-30 in the Cobra.

 

mobile 1 5w-30
7 quarts and a k&n oil filter

 

Well pouring the oil in the engine will contaminate it as well, but yes of course you have to change the filter.

Drain and fill with however much it takes to get to the line on the dipstick. I buy the gallon or whatever size at Wal-Mart, 10W-30. 2 cars, I try to change them around the same time.

I buy my filter at NAPA, their store brand is a Wix filter, which is supposed to be pretty good. I found a few oil filter review sites online that list Wix as one of the better quality filters for the money.