I have an oil leak that is dripping from the drivers side about half a foot away from the wheel. Im loaing about a quart every 75 to 90 miles. And I recently replaced the valve seal cover thinking that was it. Could it be a main seal?

That's about the location it would leak if rear main seal but it's possible it could be coming form another source and running back there... Suggest cleaning oil off engine then using UV dye in oil, check for leak with black light and glasses after driving awhile... Rear main crank seals are not a common leakage problem on any engine in Corolla.. OR Toyota in general.!