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You can go a while with synthetics. It really depends on how the car was used, if it had a chance to accumulate moisture, the temp, etc. I just changed the oil in the SS a week ago and the last change was back in April. The oil looked and smelled fine but there was a little moisture in the cap but not too big of a deal.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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