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Rattling high rpm

Valves rattling under load, high rpm

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Sounds like the viscosity of your oil is not high enough for the mileage. My van has a loud valve rattle when it is low on oil or is in need of an oil change. I use I higher viscosity oil and a bottle of lucas oil stablelizer and it quites right up. This may not be the case for you. You need to isolate the noise. By isolating the noise it will give you a better idea of whats making the noise. Try using a mechanics stethoscope and find where the noise is coming from. It might just be time for your mechanic to overhaul your engine.

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