I'd clean it since the manifolds aren't that hard to get off then plug the egr so it doesn't happen again. That way you can have peace of mind. That's what I plan on doing, at least.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo