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Daniel Fleming






Walnut blasting, rod bearings


Hi Gil! I want to thank you for taking the time to take my question, my daily driver is a 2014 M5 competition and I have racked up over 70,000 miles on it, my question is: does it need walnut blasting done? I’ve seen tons of pictures of other directed injected turbo BMWs that needed it bad but can really find any for the turbo V8s S63 or even N63. Also when would you recommend the rod bearings being replaced? I’ve seen where the S65 and S85 had problems with rod bearings.
Thank you so much for your time,



This Post Has 3 Comments

  1. Hey Gil,
    Hope all is well with you my friend.
    I have a follow up to your reply about Walnut blasting, Does walnut blasting require removal of the head? I’m assuming it does – what is the usual cost for that on a straight six? Does someone like you do the blasting or is it a specialty shop?

    Thanks – don’t mean to hi jack this thread. Appreciate reading your tech stuff – it’s such good advice!


  2. Hello Mr. Bromley, the walnut blasting does not require the removal of the head, it does require the removal of the intake manifold. Any shop that has the equipment can do it, there are not many shops that do. The cost depends on the year and model as the labor involved in removing the intake manifold will vary. Thank you for the kind words.

    Gil Neves

    1. Follow up to the follow up on walnut blasting- let’s use the new M240i as an example for cost purposes. When that motor needs it what would you think might be the ball park figure for walnut blasting? I’m curious because it’s a car I’m interested in and it looks like all direct injected cars will need this around 70k miles. At least that seems like what I’ve gleened from your replies.

      Thanks Gil – your input is more than valuable and I thank you for your time and willingness to assist us with all the technical questions that are so important to our membership! Can’t thank you enough for your help!
      Tim – PS: please call me Tim by the way if you would be so kind. I feel old enough as it is…:-)

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