Both show no signs of bearing material in oil and are up to date for oil changes. I did plugs on one a year ago. Inspected all coils even peeked at piston tops with light. I didnt find Jack wrong with it..... Both have been doing it for roughly 10k and or about a year since they have owned them. Both are daily driven street cars.
I do not recall any kind of valve train tick of any kind but i was 17 and it was my 2nd engine id touched so no seasoned ears. Maybe it did it too........
1) air in lifters or couple bad ones *read rb valvetrain is bullet proof*
2) oil control problem possibly i recall rb's having a crutch in that department ? *been running for a year*
3) rod bearings or broken ring lands *no bearing material in pan*
4) turbo ceremic wheel noisy/worn or exhaust leak doubt it...... *no visible leaks from a glance over*
5) i have no idea they run great pull hard maybe its normal
reason im asking is i just bought one of them and am debating a teardown
