Answer
Dec 10, 2025 - 05:33 PM
For the Sinister Diesel Bypass Oil Filter System on a 1999-2003 Ford Powerstroke 7.3L, replace the bypass oil filter every 15,000 miles, or as directed by Sinister Diesel and your owner’s manual. Factors such as oil quality, driving habits, and engine workload may affect intervals, so regular oil analysis and filter inspection are highly recommended for optimal performance.
