I used a lot of elbow grease
But I would use manifold cleaner / spray etc next time (anything that breaks down grease). You will need small brush or old toothbrush etc also. Be careful getting the screws out, recommend good magnetic tools for the ones at the back that are difficult to reach, otherwise there is a risk of dropping them (never to be seen again). I also have all the part codes for replacement screws, washers and parts etc if anyone is interested?
You think thats dirty, but I have seen worse (in another SQ5)! Plus my SQ5 has been run on mostly premium diesel (Shell V-Power), so if you use regular or supermarket, I could imagine that it will be even worse. EGR valve / recirculation is such a [email protected]
design for longevity of your engine, its there purely to meet emission standards! I would like to take the actual manifold off, but there are so many cables and bits in the way, I'm not sure it can be done easily
Ultimately an EGR delete (which requires a DPF delete and remap to work) is the best solution for avoiding this issue. But its not legal and you will fail your MOT test (UK only).
At least with electric vehicles these types of issues go away... but probably replaced with battery issues etc