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Message: [QUOTE="T_W6.7, post: 1317535, member: 24007"] 2 stroke oil is OK for pre common rail injection systems, it works very well in VP44 injected cummins engines and I'd assume P7100 pumps as well. I would be very reluctant to try it in any common rail systems, I've had a few friends try it in their 6.4's with poor results, IDS showed a couple injectors out of whack shortly after using it, burned through the tank as quick as possible, been diesel and stanadyne ever since with no problems. I used it in my old 06 5.9 cummins and noticed a lot more knock when the injectors were firing, stopped using it and that went away. I have a 98 24 valve cummins with the VP44 and it seems to quiet the injection system down and get marginally better economy. I would stick with a quality additive such as stanadyne, schaeffers soy shield, or optilube xpd by itself in a common rail injected pickup [/QUOTE]

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