NP Blog

Why Subaru FA & FB Engines Suffer From Oil Drain-Back If you've owned your Subaru for a while, you may have noticed that familiar clack-clack-clack on cold starts, that brief moment before oil pressure builds and everything quiets down. That's not just "Subaru being Subaru." Subaru FA and FB series engines have inverted oil filters mounted on the top of the engine and suffer from a prolonged dry start due to oil draining from the feed and output side of the oil filter following engine shutdo …