I used to drain oil, strain it through a few layers of old heavy drape material, can it up and pour in a quart or maybe two before filling up. Never had problems. I would never get oil in the fuel in any higher concentration than that and every fourth or fifth tank, run a tank of straight fuel through until really close to empty.

It got rid of my drained oil and the stuff pushed me down the road in the bargain.

__________________
2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

Annoy a Liberal, Read the Constitution