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2. Engine break that biznatch.
Like Crazy Drew said in his giant wall of text:
"Once you reach 4000 rpm, leave the car in gear with the clutch out and engine brake your way back down to 2500 rpm. Doing this will generate a large vacuum inside the motor and draw oil back into the ring lands and wash the particles you just generated into the oil system where they can be filtered out. Repeat this step for as much as your wallet/LEO's/time allows."
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