I have a pretty significant oil leak coming from somewhere. I've checked the things I can get to easily - turbo oil return line, valve cover, oil pan + drain, oil filter tightness, but it seems to be dripping onto the splash guard on the left side of the car, then onto the ground. Compression is good in all cylinders, coolant has no oil in it, and the oil is free from coolant (so no head gasket issues).
A mechanic at work wants to say it might be the front main seal, which makes sense considering where its dripping from. Most major seals (unsure of that one) have been replaced within the last 20,000 miles, as was the timing belt, serpentine belts, and water pump. The current rate of oil loss is around 1 qt per 1,000-1,500 miles.
Any ideas?