Howdy all, During my euro road trip my 08 HR350z developed a ticking / knocking from the front of the car, it sounds as if its coming from the coolant reservoir / dipstick area. This problem only happens when well ran in and hot and the ticking increases and decreases with RPM.
Now, the odd thing is, while on route back we went via the stelvio pass and in the high altitude the car didnt make the noise at all. Even through switzerland which most of the time in those locations we were at 1800M above sea level. As soon as we decended back down to a normal altitude the noise started again. Do you think it could be possibly be a fuel / oil pressure issle even though the noise is from the front of the block? Or maybe even just needs an oil change even though it was serviced 6 months ago.
Cheers
J