When it’s hot, oil has amazing creep properties and dust will stick to it. If the leak is severe it will clear a path through the dirt indicating the source. That you have a general build up of oily gunk is a good thing since it indicates wicking of what little oil is escaping. Unless you see drips from under the car or more than half a litre oil loss between oil changes then the oil leak is so minor it is not worth spending time and money on it. I have two of these old S124s and I just keep them running by fixing the mission critical items.
When it’s hot, oil has amazing creep properties and dust will stick to it. If the leak is severe it will clear a path through the dirt indicating the source. That you have a general build up of oily gunk is a good thing since it indicates wicking of what little oil is escaping. Unless you see drips from under the car or more than half a litre oil loss between oil changes then the oil leak is so minor it is not worth spending time and money on it. I have two of these old S124s and I just keep them running by fixing the mission critical items.
Wow my dream build, what engine mounts and engine arms did you use ?
Do you have your engine mated to the orignal 7.224 auto gearbox ?
My injection pump leaks at that throttle lever exit in case that's any help.
Piston rings and valve seals gone
What makes you think that? I'll check again but I don't think the valve cap moves when on loose.
@22rabbits excess leakage past the engine piston rings .blow by. Too much pressure in crankcase. Nothing else can make oil come out of pcv