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Haydn - thanks for the tip. I have looked at the egr pipe flange where it meets the air intake and it doesn’t seem too bad, and the flange where the air intake pipe bolts onto the plenum chamber seems ok too as does where the manifold bolts to the head (no oil being purged out between the mating surfaces). I haven’t checked the egr valve itself though so thanks for that, I will certainly give it a look over.