Features and Benefits:
- The new and improved Filter Block is CNC Machined from Solid Billet 6061 Aluminum
- High Strength, Abrasion Resistant Silicone Hoses with molded T for reduced point of failure
- Extends the life of your Water Pump, Oil Cooler, and EGR Cooler
- Maintains optimal coolant flow as this is a bypass filtration kit
- 1 Year Warranty
Includes:
- Genuine WIX Coolant Filter
- Filter Block
- Mounting Bracket
- Nickel plated ball valves
- Silicone Hoses
- Molded Silicone T-Hose
- Installation Hardware
Q: What coolant filters work best with Sinister Diesel coolant filtration kits?
A: The two most popular and proven options are the WIX 24070 and the CAT 435-5142. Both deliver excellent protection against casting sand, rust, and debris that can clog your heater core, EGR cooler, Oil Cooler or water pump.
Q: What’s the difference between the WIX 24070 and the CAT 435-5142?
A: The WIX 24070 is slightly taller at 5.25 inches, while the CAT 435-5142 is more compact at 4⅜ inches. The WIX filter is lighter (about 1 lb) and designed for smooth, high-flow operation, while the CAT filter is heavier (about 2 lb) with a thicker steel housing for extreme durability.
Q: Which filter do most customers use?
A: The WIX 24070 is our standard recommendation for most Sinister Diesel coolant filtration kits. It’s affordable, widely available, and requires no additives—just pure debris filtration and easy maintenance.
Q: When should I consider using the CAT 435-5142 instead?
A: The CAT 435-5142 is a great upgrade for heavy-duty or high-vibration applications. If your truck tows frequently, runs in harsh conditions, or you prefer OEM-grade construction, the CAT filter’s heavier shell and reinforced core are a solid choice.
Q: Does either filter add coolant additives or chemicals?
A: No—both filters are non-pelleted. That means they don’t release Supplemental Coolant Additives (SCAs). If you’re running Extended Life Coolant (ELC), that’s perfect—no extra maintenance needed.
Q: Are both filters compatible with Sinister Diesel kits?
A: Absolutely. Both the WIX 24070 and CAT 435-5142 thread directly into Sinister Diesel coolant filtration heads (11/16-16 thread). Fitment is perfect on Powerstroke, Cummins, and Duramax applications.
Q: Which one is better for a limited space under the hood?
A: The CAT 435-5142 is shorter at 4⅜", so it’s ideal if your installation area has less vertical clearance. (Which is why it's the only choice for some kits)
Q: Which filter provides better coolant flow?
A: The WIX 24070 typically offers slightly higher flow due to its taller design and lighter internal construction, making it ideal for daily drivers.
Q: How often should these filters be replaced?
A: Replace the first filter after 500 miles to remove initial debris from the system.
Then replace the second filter around 1,000 miles, and the third one at 3,000 miles.
After that, change the coolant filter with every oil filter service to keep your cooling system performing at its best.
These intervals apply to both the WIX 24070 and CAT 435-5142.
Q: What’s the bottom line better filter?
A: WIX 24070: Best all-around filter for most trucks — easy, reliable, and affordable. (Most sold filter for Sinister Diesel Kits)
CAT 435-5142: Heavy-duty option for extreme use or customers who prefer CAT’s OEM-grade toughness.
Both keep your cooling system clean, protected, and performing at its best.
