Potential Buyer of 2012 GT/CS with engine ticking
New member here. I have been talking to a guy with a 2012 Mustang GT/CS with 75k miles. Has HIDs, Glass roof, 6 speed, and is in pretty good shape. He noted that recently the car started making a ticking noise when the car is in higher RPMs (1800-3500 ish) and does not tick at idle. I have googled this issue and most/all threads I found appear to be when the cars were newer so I don't think those issues would relate.
He brought it to a buddy of his and he ran a compression test which turned out that there is lower compression in cylinder 7 (dont know the exact numbers). Could this be a sticky lifter, broken piston ring or maybe a valve trane issue? Any other ideas?
I can get it for around 12k ish which got me wondering if it is worth it to take the risk. Worst case scenario, how much would you expect me to have to pay to get it fixed (I know its hard to say).