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Re: Engine lifespan
310k on my '99 5.3 and 4l60e. Bought it new and change the fluids often. No major problems yet......
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72 GMC Sierra Grande SWB 402 BB A/C
(Owned it since 1973)
99 Silverado 1500 LT with 315K miles
(RIP)
2012 GMC Sierra SLT
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