[eckoman_pdx]

What does ABS have to do with the Oil Pan?

Anyways, get a haynes/helms/factory manual. You should be able to find a Honda/Acura OEM repair manual in .pdf on a torrent search. Drain the oil, remove the bolts, remove the oil pan, clean the old gasket off the block, install new gasket, new oil pan, torque down to the proper specs, install new drain plug and crush washer, re-fill with oil.

As for gas, some premium gases have cleaners in them. Maybe you have a clogged fuel filter, injectors, ro some junk that the cleaners in the premium is cleaning out? IDK, that's just a total shot in the dark and probably no help, but oh well...