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With maybe 40,000 miles on the Suburban (although I know it was doing well long after I sold it), and around 30,000 on the M1009, both were doing just fine. More importantly, I would trust Gale's 3% longevity loss assessment as he knows what he's talking about. Apply that to 400,000 miles if you...

I asked the same question when we installed a Banks turbo on a then-new '85 Suburban. According to Gale, one can expect a 3% loss in longevity. He said that the 6.2 is good for about 200,000 miles, so with his turbo that'd take it down to around 194,000 miles. Well worth it, I think. Banks...