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I usually do it around 5-10%, but I could go longer I bet since I use Mobile Super 3000 XE low saps. I believe the OLM is set for 7,500 miles regardless, so consider it more of a timer than actual "life" remaining. The fuel filter is the same, programmed to 1000 gallons. The only real way to know is sending a sample to a lab for analysis. Some guys have gone 10k between changes with sufficient life left in the oil. I think the Delco filters are good for 15k.
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1997 Camaro Z28 - 355 LT1, T56, CC503, LTs, ORY, Bald Eagle-back exhaust, !emissions, Lingenfelter CAI, EWP, !CAGS, BMR LCAs, UMI PHB, Koni Str.t/Koni SA, C5 Z06 front / LS1 F-body rear brake swap, factory hurst with short stick 
2014 2LT Cruze 2.0 Turbo Diesel
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