Seller notes

Removed from our 2013 BMW X5 M with 128,000 miles. Reason: our original engine needed valve stem seals replaced at 128,000 miles. Otherwise was working great—no engine codes. It was stock. Shipped that engine to RK Autowerks to be rebuilt, but they did not return our engine. Months later we received a different engine back, stamped "N63." They said they no longer even had our block. We returned the N63 to RK for a refund, and they provided a different S63 engine back.After the hassle of months...

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