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How many miles are on the car to begin with? The LS doesn't have the turbo so its not as impacted by oil changes. I will contend however that until recently the dealer oil was total crap. If it were me I'd take off the oil cap and see it it looks like there is excessive varnish/sludge by the cam. Amsoil sells an engine flush that might be a good idea if you decide to purchase the car.
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