Mostly apparent when the vehicle is cold. It is less noticeable when the vehicle is warm. Timing chain guides have not been done. The truck is a 2012 LR4 HSE Luxury Limited with all options including HD package and rear seat entertainment. It took me a while to find one with all these options so I'm hoping the engine isn't about to go or something! It has only 67,000km (41k miles) on it and it was just serviced at an LR specialty shop using OEM or better fluids etc.