My car’s started leaving a patch of oil when I park up. It’s more than the usual occasional drop, so it’s something I need to sort. The puddle forms under the engine to bell housing joint. My first thought was that it will be the cylinder head o-ring, but the amount of oil on the side of the block doesn’t seem to be that much compared to the leak. There’s also a leak from one of the external oil pipes. I’ve got a box of assorted O-rings, so can try replacing that if the O-rings are a standard size.