Symptoms
Coolant loss, coolant crust near the turbos, low-coolant warning.
The fix, step by step
- Pressure-test the system and replace the turbo feed and return lines as a set.
- FCP Euro calls them 'a common failure item' on the M157.
- The job is the same as on a G 63, but with more height to work at.
Tools & part numbers
- Pressure tester
- line wrenches
- MB 325.6 coolant
Where to buy the parts
Rein M278/M157 turbocharger coolant line repair kitFCP Euro ↗Amazon ↗
Genuine Mercedes coolant, MB 325.6, 1 galFCP Euro ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Mercedes-Benz G 63 AMG 6×6 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.