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Originally Posted by skorpion317
matt, don't use the synthetic stuff. it's not a good idea for a high mileage engine, since the synthetic stuff is usually thinner than the regular oil. go with a high mileage protection formula, like Castrol GTX High Mileage or something similar.
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Yup, chances are it is going to start burning off or leaking out the valve seals, there is no reason to use synthetic at all if you change your oil regularly. I don't even use it on my LS1.