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SAVE YOURSELF A HEADACHE Blue Def exhaust fluid - FYI - 2021 Chevrolet [ p21DD code Duramax ]
PLATINUM blue def causing issues dpf system on my beloved 3.0 Duramax. Anyone else notice this?
How to fix code P21DD Reductant heater replacement on 2015 Chevrolet 2500hd 6.6 Duramax
Duramax 6.6L Service Exhaust P21DD P20B9… Most Common Repair
DEF Decoder and Secret Stash for the Duramax Raided?!?
Chevy DuraMax Diesel Exhaust Fluid Quality Poor How To Test & Fix
ADDING BLUE DEF …🛑BE AWARE OF EXPIRATION DATE🔍..STEPS IN THIS VIDEO
DEF Poor Quality, Drain The Tank. GMC, Chevrolet, Silverado, Sierra, Denali, Duramax.
Service DEF System - this fix worked for me
Duramax def fluid system
2022 Silverado 3500hd Duramax DEF Fluid
Duramax 2nd opinion… Exhaust Fluid Quality
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