Seems like a perfect case to get an oil analysis done, after all you don't want water condensing in your oil or the oil becoming acidic or diluted with fuel.
I didn't know anyone still recommended 3,000 mile oil changes, my car says right on the sticker on the air filter and in the owners manual to change it every 7,500 miles so I put synthetic in and change it every fall with 10,000 to 12,000 miles on that oil change and haven't had any oil related problems.
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