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FLASHSALE
Royal Purple Duralec Ultra Diesel 10W30 CK-4 Motor Oil - 55 Gallon
Sale price
$2,252.99
Regular price $1,801.99Pickup currently unavailable
Duralec Ultra combines premium base oils with Royal Purple's proprietary additive technology, Synerlec, to create a high-performance motor oil that optimizes engine performance and provides superior protection in rigorous on/off highway applications. Synerlec provides unsurpassed film strength and lubricity – up to 4X more than top competitors. In addition, advanced synthetic solvency reduces engine deposits and keeps engines clean. The net result is a better performing engine, with reduced downtime and lower cost of ownership. Royal Purple recommends for use in a variety of heavy-duty applications including commuting, over-the-road trucking, agriculture, construction and mining.
- Extraordinary performance in older generation, high-output diesel engines
- Maximum wear protection – up to 33% better than CK-4 requirements
- Extended oil life – up to 40% better than CK-4 requirements
- Improved cold flow operation and start-up protection
- Reduced oil consumption
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1994-2001 | AM General | Hummer | Base |
| 1997,1999-2000 | Chevrolet | C3500 | Base |
| 1997-1998 | Chevrolet | C3500 | Cheyenne |
| 1999-2000 | Chevrolet | C3500 | LS |
| 1997-1998 | Chevrolet | C3500 | Silverado |
| 1997-2002 | Chevrolet | Express 2500 | Base |
| 1996-2002 | Chevrolet | Express 2500 | LS |
| 1996-2002 | Chevrolet | Express 3500 | Base |
| 1996-2002 | Chevrolet | Express 3500 | LS |
| 1994-2001 | Dodge | Ram 2500 | Base |
| 2003-2006,2009 | Dodge | Sprinter 2500 | Base |
| 2003-2006,2009 | Dodge | Sprinter 3500 | Base |
| 2003-2005 | Ford | E-350 Club Wagon | Chateau |
| 2003-2005 | Ford | E-350 Club Wagon | XL |
| 2003-2005 | Ford | E-350 Club Wagon | XLT |
| 1995-1998 | Ford | E-350 Econoline | Base |
| 1995-1998 | Ford | E-350 Econoline | XL |
| 1995-2002 | Ford | E-350 Econoline Club Wagon | Chateau |
| 1995-1996 | Ford | E-350 Econoline Club Wagon | Chateau HD |
| 1995-2000 | Ford | E-350 Econoline Club Wagon | Custom |
| 2001-2002 | Ford | E-350 Econoline Club Wagon | XL |
| 1995-1998 | Ford | E-350 Econoline Club Wagon | XL HD |
| 1995-2002 | Ford | E-350 Econoline Club Wagon | XLT |
| 1995-1998 | Ford | E-350 Econoline Club Wagon | XLT HD |
| 1999-2010 | Ford | E-350 Super Duty | Base |
| 2006 | Ford | E-350 Super Duty | Chateau |
| 1999-2000,2006-2008,2010 | Ford | E-350 Super Duty | XL |
| 2006-2010 | Ford | E-350 Super Duty | XLT |
| 2003 | Ford | Excursion | Eddie Bauer |
| 2000-2003 | Ford | Excursion | Limited |
| 2000-2003 | Ford | Excursion | XLT |
| 1997 | Ford | F-250 HD | XL |
| 1997 | Ford | F-250 HD | XLT |
| 2009-2010 | Ford | F-250 Super Duty | Cabela's |
| 2008-2009 | Ford | F-250 Super Duty | FX4 |
| 2008-2010 | Ford | F-250 Super Duty | Harley-Davidson Edition |
| 2008-2026 | Ford | F-250 Super Duty | King Ranch |
| 1999-2003,2008-2026 | Ford | F-250 Super Duty | Lariat |
| 2018-2024 | Ford | F-250 Super Duty | Limited |
| 2013-2026 | Ford | F-250 Super Duty | Platinum |
| 1999-2003,2008-2026 | Ford | F-250 Super Duty | XL |
| 1999-2003,2008-2026 | Ford | F-250 Super Duty | XLT |
| 2009-2010 | Ford | F-350 Super Duty | Cabela's |
| 2008-2009 | Ford | F-350 Super Duty | FX4 |
| 2008-2010 | Ford | F-350 Super Duty | Harley-Davidson Edition |
| 2003,2008-2026 | Ford | F-350 Super Duty | King Ranch |
| 1999-2003,2008-2026 | Ford | F-350 Super Duty | Lariat |
| 2018-2024 | Ford | F-350 Super Duty | Limited |
| 2013-2026 | Ford | F-350 Super Duty | Platinum |
| 1999-2003,2008-2026 | Ford | F-350 Super Duty | XL |
| 1999-2003,2008-2026 | Ford | F-350 Super Duty | XLT |
| 2002,2004-2006 | Freightliner | Sprinter 2500 | Base |
| 2002,2004-2006 | Freightliner | Sprinter 3500 | Base |
| 2006 | Hummer | H1 | Alpha |
| 2002-2004 | Hummer | H1 | Base |
| 2016-2019 | Nissan | TITAN XD | Platinum Reserve |
| 2016-2019 | Nissan | TITAN XD | PRO-4X |
| 2016-2019 | Nissan | TITAN XD | S |
| 2016-2019 | Nissan | TITAN XD | SL |
| 2016-2019 | Nissan | TITAN XD | SV |
| 2019-2024 | Ram | 2500 | Big Horn |
| 2019-2024 | Ram | 2500 | Laramie |
| 2019-2021 | Ram | 2500 | Laramie Longhorn |
| 2019-2024 | Ram | 2500 | Limited |
| 2021-2024 | Ram | 2500 | Limited Longhorn |
| 2019-2024 | Ram | 2500 | Lone Star |
| 2023-2024 | Ram | 2500 | Rebel |
| 2024 | Ram | 2500 | Special Service |
| 2019-2024 | Ram | 2500 | Tradesman |
| 2019-2024 | Ram | 3500 | Big Horn |
| 2019-2024 | Ram | 3500 | Laramie |
| 2019-2020 | Ram | 3500 | Laramie Longhorn |
| 2019-2024 | Ram | 3500 | Limited |
| 2021-2024 | Ram | 3500 | Limited Longhorn |
| 2019-2022 | Ram | 3500 | Lone Star |
| 2020-2024 | Ram | 3500 | SLT |
| 2024 | Ram | 3500 | Special Service |
| 2019-2024 | Ram | 3500 | Tradesman |
Sale price
$2,252.99
Regular price $1,801.99Duralec Ultra combines premium base oils with Royal Purple's proprietary additive technology, Synerlec, to create a high-performance motor oil that optimizes engine performance and provides superior protection in rigorous on/off highway applications. Synerlec provides unsurpassed film strength and lubricity – up to 4X more than top competitors. In addition, advanced synthetic solvency reduces engine deposits and keeps engines clean. The net result is a better performing engine, with reduced downtime and lower cost of ownership. Royal Purple recommends for use in a variety of heavy-duty applications including commuting, over-the-road trucking, agriculture, construction and mining.
- Extraordinary performance in older generation, high-output diesel engines
- Maximum wear protection – up to 33% better than CK-4 requirements
- Extended oil life – up to 40% better than CK-4 requirements
- Improved cold flow operation and start-up protection
- Reduced oil consumption
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1994-2001 | AM General | Hummer | Base |
| 1997,1999-2000 | Chevrolet | C3500 | Base |
| 1997-1998 | Chevrolet | C3500 | Cheyenne |
| 1999-2000 | Chevrolet | C3500 | LS |
| 1997-1998 | Chevrolet | C3500 | Silverado |
| 1997-2002 | Chevrolet | Express 2500 | Base |
| 1996-2002 | Chevrolet | Express 2500 | LS |
| 1996-2002 | Chevrolet | Express 3500 | Base |
| 1996-2002 | Chevrolet | Express 3500 | LS |
| 1994-2001 | Dodge | Ram 2500 | Base |
| 2003-2006,2009 | Dodge | Sprinter 2500 | Base |
| 2003-2006,2009 | Dodge | Sprinter 3500 | Base |
| 2003-2005 | Ford | E-350 Club Wagon | Chateau |
| 2003-2005 | Ford | E-350 Club Wagon | XL |
| 2003-2005 | Ford | E-350 Club Wagon | XLT |
| 1995-1998 | Ford | E-350 Econoline | Base |
| 1995-1998 | Ford | E-350 Econoline | XL |
| 1995-2002 | Ford | E-350 Econoline Club Wagon | Chateau |
| 1995-1996 | Ford | E-350 Econoline Club Wagon | Chateau HD |
| 1995-2000 | Ford | E-350 Econoline Club Wagon | Custom |
| 2001-2002 | Ford | E-350 Econoline Club Wagon | XL |
| 1995-1998 | Ford | E-350 Econoline Club Wagon | XL HD |
| 1995-2002 | Ford | E-350 Econoline Club Wagon | XLT |
| 1995-1998 | Ford | E-350 Econoline Club Wagon | XLT HD |
| 1999-2010 | Ford | E-350 Super Duty | Base |
| 2006 | Ford | E-350 Super Duty | Chateau |
| 1999-2000,2006-2008,2010 | Ford | E-350 Super Duty | XL |
| 2006-2010 | Ford | E-350 Super Duty | XLT |
| 2003 | Ford | Excursion | Eddie Bauer |
| 2000-2003 | Ford | Excursion | Limited |
| 2000-2003 | Ford | Excursion | XLT |
| 1997 | Ford | F-250 HD | XL |
| 1997 | Ford | F-250 HD | XLT |
| 2009-2010 | Ford | F-250 Super Duty | Cabela's |
| 2008-2009 | Ford | F-250 Super Duty | FX4 |
| 2008-2010 | Ford | F-250 Super Duty | Harley-Davidson Edition |
| 2008-2026 | Ford | F-250 Super Duty | King Ranch |
| 1999-2003,2008-2026 | Ford | F-250 Super Duty | Lariat |
| 2018-2024 | Ford | F-250 Super Duty | Limited |
| 2013-2026 | Ford | F-250 Super Duty | Platinum |
| 1999-2003,2008-2026 | Ford | F-250 Super Duty | XL |
| 1999-2003,2008-2026 | Ford | F-250 Super Duty | XLT |
| 2009-2010 | Ford | F-350 Super Duty | Cabela's |
| 2008-2009 | Ford | F-350 Super Duty | FX4 |
| 2008-2010 | Ford | F-350 Super Duty | Harley-Davidson Edition |
| 2003,2008-2026 | Ford | F-350 Super Duty | King Ranch |
| 1999-2003,2008-2026 | Ford | F-350 Super Duty | Lariat |
| 2018-2024 | Ford | F-350 Super Duty | Limited |
| 2013-2026 | Ford | F-350 Super Duty | Platinum |
| 1999-2003,2008-2026 | Ford | F-350 Super Duty | XL |
| 1999-2003,2008-2026 | Ford | F-350 Super Duty | XLT |
| 2002,2004-2006 | Freightliner | Sprinter 2500 | Base |
| 2002,2004-2006 | Freightliner | Sprinter 3500 | Base |
| 2006 | Hummer | H1 | Alpha |
| 2002-2004 | Hummer | H1 | Base |
| 2016-2019 | Nissan | TITAN XD | Platinum Reserve |
| 2016-2019 | Nissan | TITAN XD | PRO-4X |
| 2016-2019 | Nissan | TITAN XD | S |
| 2016-2019 | Nissan | TITAN XD | SL |
| 2016-2019 | Nissan | TITAN XD | SV |
| 2019-2024 | Ram | 2500 | Big Horn |
| 2019-2024 | Ram | 2500 | Laramie |
| 2019-2021 | Ram | 2500 | Laramie Longhorn |
| 2019-2024 | Ram | 2500 | Limited |
| 2021-2024 | Ram | 2500 | Limited Longhorn |
| 2019-2024 | Ram | 2500 | Lone Star |
| 2023-2024 | Ram | 2500 | Rebel |
| 2024 | Ram | 2500 | Special Service |
| 2019-2024 | Ram | 2500 | Tradesman |
| 2019-2024 | Ram | 3500 | Big Horn |
| 2019-2024 | Ram | 3500 | Laramie |
| 2019-2020 | Ram | 3500 | Laramie Longhorn |
| 2019-2024 | Ram | 3500 | Limited |
| 2021-2024 | Ram | 3500 | Limited Longhorn |
| 2019-2022 | Ram | 3500 | Lone Star |
| 2020-2024 | Ram | 3500 | SLT |
| 2024 | Ram | 3500 | Special Service |
| 2019-2024 | Ram | 3500 | Tradesman |
FAQ
Most orders ship within 1–2 business days. Engines and oversized items may require additional handling time. You’ll receive tracking as soon as your order leaves our warehouse.
If a product is backordered, we’ll notify you right away with an estimated restock date. You can choose to wait, swap, or cancel.
Once your order ships, you’ll receive an email with tracking information. You can also log into your account anytime to check order status.
We’ve been in your shoes. From first bolt-ons to full custom builds, our crew can guide you the right way.
Every product we sell is chosen with one goal in mind: helping you build faster, stronger, and more reliable machines.
We team up with the best brands so you can build with confidence.