Morning folks,

I've got an intermittent ticking noise from the top end (m50b20tu) for a while now, not sure what causes it but I've only noticed it sitting in traffic (cars side-by-side rebounding the noise), but mostly with a warm engine on hot days.

Fairly certain a good drive is what cures it, but I only hear it in traffic and not when I'm parking up at home after getting out of the traffic

I'm wondering is there an oil feed that's common to clog or would it be a hydraulic tappet issue?

Has anybody else noticed/experienced it with the same eninge? Would a different oil grade help?