Ok guys, well to start things off i just recently got finished installing a custom turbo set up and got it tuned last weekend with tom. Well i pulled the plugs to change them and noticed some oil on the bottom of cyl 1 plug. SO i thought well i wanna do a compression test just to see whats up. Well im gettin 90 psi across the board. Could this be a timing issue as to why im low compression on all 4? And does is sound like valve seals if ive got oil on that plug? The VC is not leaking. Any help would be greatly appreciated.