I have a 2004 Blazer with a rectangular air filter. Do I spray the oil on the filter on both sides - top and bottom - or just one side?
Md Ariful Islam
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Dr. Md Rushad Rahman
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After properly washing the filter, you want to spray just one side, according to their maintenance tips, but honestly I don't see any harm in putting it on the other side too, as long as you let it dry properly before installing it and starting the vehicle.
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