I have an oil leak that doesn't happen until the car's driving down the road, so to locate it I need to mimic that by somehow adding load to the stationary engine. Does anyone have any tricks for accomplishing that?

 

If it's an automatic you can put it in gear, press on the brake pedal as hard as you can, then slowly add throttle.

 

it's manual... f23a1 engine in a 2000 accord lx.

 

You can use the same process then but the car will need to be on jack stands.