Went to look at buying a Focus yesterday 1.5tdci 2016 57k on the clock. I noticed an oil leak (see photo). Does anyone have an idea where it might be leaking from? Does it look expensive to fix?
That could be from either of two sources:
most likely, this is from the oil that is in the incoming air to the turbo, from the crankcase ventilation system. The outer housing is bolted to the backing plate and the clamping force may not be even around the periphery.
the high pressure oil feed - that banjo bolt is usually sealed with copper washers and may just need fresh washers and tightening.
It does not look that serious, but cleaning and further testing will confirm that.