I'm new to the subie community. I'm looking at purchasing my first one, an 09 STI at a local dealer. I've read on the dreaded ringland failure. The car drove fine, just needs an alignment. The PO left all the service records with the car, timing belt was done at 60k. I did notice when I pulled the oil cap, there was some pressure coming from the filler neck. No smoke. It seemed to go away under throttle. I've been advised to have a compression check done. Any other advice?