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SE North Dakota | Oh by running it back through the engine and decreasing the life of it. Take a tier 3 motor and pull the dipstick and take a tier 4 motor and pull that dipstick. Bet I could guess which oil is cleaner. But hey that doesn’t mean anything right? Why bother ever changing the oil right? Dirty oil doesn’t matter right?? Bearings will run forever and less scuffing on cylinders right?? | |
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