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I am running b20 in my 6.5 GM Diesel. I had to replace the 1/8" return lines that run from injector to injector. The mechanical lift pump has held up so far.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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