2004 Ford Van - Oil leak

slow oil leak but can’t find reason. checked by ford dealer. no reason for leak possible seal 0
around oil pan but can’t find. great gas millage 125,00 miles. new transmission. runs perfectly 16 plus gas milage
.

How many miles do you go before you have to add a quart?

If it’s not leaking it externally, it must be burning it.

What size engine, had an 03 truck, debris in manufacture caused head gasket to leak oil on to the manifold, put in a chunk of metal to divert the oil drops away from the manifild. No significant oil loss. There was a TSB, but no recall.