both compression and leak down require getting to all cylinders, which means removing the manifold to get to the rear 3 cylinders in this case. which i told him i wasn't keen on doing because it takes a few hours to remove and install the manifold, and if the gasket gets damaged i have to get a new one of them also.
and none of them are going to able to really tell you if the head gasket is causing the oil on the side of the block (which is why this kid - he's only about 19, wants to do the tests). he just really doesn't seem to know what he is on about. and is getting advice from his mates who also don't seem to know too much.
as for trying to get the price lower, that isn't going to happen. and he has told me that many times he is keen, so why should i lower the price? if he didn't think the price was reasonable he wouldn't be saying that he is keen to get the car in every second message.