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Black Oil on a 72 350/4
My 350 starts, idles and runs perfectly. The problem is the oil turns BLACK after only a few miles. I recently added SeaFoam to the oil, drove it for 2 days, then changed the oil. The PCV shares a vacuum line with the gas vapor canister. I question whether the canister is any good, and may cause low vacuum to the PCV. How do I check out the canister? If I block vacuum to the canister, will it adversely alter the function of the PCV?
Last edited by brown7373; 05-18-2016 at 08:48 AM.
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05-18-2016, 08:47 AM
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