Note: Extending oil drain intervals shouldonly be done together with a comprehensive used oil analysis program, such asCastrol Labcheck. Specifications & Approvals. Suitable for mixed fleets requiring 15W-40 CK-4 or CJ-4 and earlier.
Specially formulated for engines with over 75,000 miles, this premium synthetic blend tackles the common problems associated with older engines, such as oil leaks, burn-off, and sludge build-up. Product Line GTX High Mileage.