We checked the oil pressure and it`s right on the money no problem with that.

Hello, Fried of mine just bought a 2001 S80 2.5 TDI. Runs good 347K Km (215K miles)however the engine makes a weird noise. He was hooping that it will be something easy to fix after the purchase, unfortunately after showing it to 4 different mechanics none of them were able to pinpoint the issue, so...