^That's probably what it is then as the stock cap is 2.0 bar. I'm sure running around in 110+ temps probably is what did it, that system is working hard and the engine is running HOT.

Then again, adding coolant once or twice in the hot season if you have the lower pressure cap is not as cumbersome as having your system self destruct from the high pressures.

__________________
2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards