[jerome951]

The oil cooler seals are not for the faint of heart with the header on. Like Steve said, rule out the oil filter first. The balance shafts are below the oil cooler on that side so (luckily) likely not the cause. Also check the cam tower seal to rule that out.

I replaced my oil cooler seals a few weeks ago while I had the head and header off. Kinda a pita even with those things out of the way. Besides some big wrenches for the oil lines and sender, I think the only other special tool is the relief valve alignment tool.

Greg, that oil will ruin your sway and control arm bushings in short order.