Right now I am running Mobile clean 5000 5w-30 and Napa gold filter and my OCI are 5,000 miles. I was thinking about using 4qts of Mobile and 1qt of Synthetic and extending my OCI to 7,500 miles. Do you think this would offer the same amount of protection as my Dino 5,000 OCI? Before you say just run all Synthetic I cannot afford $50 oil changes..I get 5qts of Mobile at Wally world for $10 and my Napa discount gets my gold filter for $5.
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