[Ameiseuk]

Ive had a similar problem since engine rebuild. Noticeably worse if i use the car after its been parked uphill on the driveway.
Checked cv joints, gearbox seals, rocker gaskets etc and all seemed dry.

Happened to lift the bonnet after a long drive a couple of weeks back to check screenwash. Engine was still running, as i filled the washer bottle big puff of oily smoke from rear right side of engine. With the same smell! Looks like im getting the odd drip from rocker cover straight on to the manifold.

Did a bit of further reading, going to pull the rocker covers, thoroughly clean them and reassemble along with a taste of brush on sealing compound to see if that helps cure the problem.