[v8volvo]

Glad to hear you are going to tackle it! You and the car will both be glad you did. :-)

As you have already found, diagnosing oil leaks in this area can be tricky since the mess goes everywhere as soon as the car gets driven. As Jason suggested, start with the easy and obvious... don't assume it is a front crank seal or oil pump gasket leak unless you can see the leakage obviously coming from there. Oil cooler seals can leak, the turbo inlet can drip large amounts of oil from the CCV system or have leaks from the oil supply/return lines, a common valve cover gasket leak can come all the way down and simulate leakage from a different area.... etc.

One suggestion: due to the exposure of this area of the engine to wind from the radiator fan and/or airflow around the car at speed, rather than cleaning the area and then driving the car to see where the leak is coming from, you may have better results from cleaning it and then running the engine with the car stationary as far as pinpointing the leak source. If you have a weekend day free, you can idle the motor for several hours or all day if necessary. (If your car is an automatic, though, be sure to do this with the transmission in 1st gear and the rear wheels off the ground on jack stands -- idling for very long periods in neutral can cook an otherwise healthy ZF trans, and idling in gear for very prolonged periods can lead to overheating of the trans fluid.)

Hope you are able to figure it out! One other thing to look at -- take the upper timing belt cover loose and look inside for evidence of oil leakage. If the leak is coming from the front main seal, you will also see oil everywhere inside the belt cover -- the TB acts like a conveyor belt and flings the oil all over the place. If it is dry in there (and you hope it is), then the crank and cam seals are fine. If it is not dry, then you have found your issue, and you do not want to even crank the engine again until you have fixed it... oil contamination weakens timing belts, and if that belt breaks, your engine is hosed!