Sinister Diesel Coolant Filtration System with WIX Filter for 2011–Early 2015 Duramax LML
Help keep casting sand, metal shavings and other debris out of your 6.6L Duramax LML’s coolant. This Sinister Diesel bypass filtration system uses a genuine WIX coolant filter to filter a small portion of coolant while the engine runs, helping reduce debris-related wear and blockage in cooling-system components.
Important fitment exclusions: Not compatible with trucks equipped with dual alternators or later 2015.5 and newer trucks. Confirm your truck’s configuration before ordering.
Built for filtration and easy servicing
- Bypass filtration: Filters small amounts of coolant while the engine is running.
- Billet aluminum filter block: CNC-machined from 6061 aluminum and anodized in Sinister Blue.
- No-drill mounting: The supplied bracket mounts to factory holes.
- Silicone hoses with pre-assembled fittings: Simplify connections. The manufacturer states the connections are tested at twice the recommended radiator-cap pressure.
- Replaceable spin-on filter: Unscrews for routine servicing.
- Filter-block layout: Two threaded inlet ports and one outlet port.
What’s in the kit
- Genuine WIX coolant filter
- Filter block
- Mounting bracket
- Silicone hoses and fittings
- Installation hardware
Vehicle fitment
For 2011–early 2015 Chevrolet and GMC 2500 and 3500 models equipped with the 6.6L Duramax LML engine, excluding dual-alternator configurations. Does not fit later 2015.5+ trucks. For a 2015 truck, verify which configuration you have before purchase.
Installation and filter maintenance
Manufacturer-estimated installation time is approximately 2 hours; actual time varies with experience.
The supplied manufacturer guidance recommends replacing the first filter after 500 miles, then replacing the second and third filters after 3,000 miles each. After those three changes, replace the filter annually.
Recommended tools: 9/16-inch and 13/16-inch wrenches, 8 mm socket, 3/8-inch 12-point socket or 5/16-inch combination wrench, large adjustable wrench, standard screwdriver, utility knife and diagonal cutters.
Part number: SD-COOLFIL-6.6-11-W