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      09-12-2017, 09:41 PM   #5079
bmw1racer
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Quote:
Originally Posted by hunginator View Post
If you have an N55, I believe that the walnut blasting method for carbon cleaning is not required. Only the N54 motors were susceptible to carbon build up.

If I'm wrong, someone please correct me.
I've read that any motor with direct injection is susceptible to carbon build up.
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