How badly do you want unfiltered oil in the engine? Toilet paper sure has fine porosity, but the flow will be insignificant. High backpressure, and the relief opens and unfiltered oil is sent to the engine. Oops, bearing wear.....
The stock MB filter has a full flow AND a fine porosity bypass filter in it already, why change?
If you want to use a fine porosity bypass filter, there are a number on the market, and NONE of them use toilet paper......
Fresh filter and oil change every 3000 miles with dino and 6000 with synthetic, the engine will outlast the body.
Synthetics are VASTLY better lubricants, no question. They also last much longer. I use Mobil 1 because I cannot find Delvac 1 around here easily. I don't expect to ever wear out an engine, either.
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!