Symptoms
Service interval, or after dusty trail use. With a camper or tray, you'll be on gravel roads more than you think.
The fix, step by step
- Loosen the captive screws around the airbox (they don't come out) and lift off the top half.
- Note how the white felt pre-filter is fitted (glued to the filter on some trucks, clipped into the box on others), then swap the filter and close it up.
Tools & part numbers
- PZ3 (Pozidriv #3) screwdriver
- filter (a forum member reports Mahle LX3985/1 matches OEM; not officially confirmed)
Where to buy the parts
Mahle LX3985/1 air filter (owner-reported OEM match; not officially confirmed)Amazon (search) ↗
Mahle LX3985 BMW air filter (close sibling of LX3985/1; check it matches before buying)FCP Euro ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Ineos Grenadier Quartermaster parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.