What DEF fluid does GM recommend?
What DEF fluid does GM recommend? Choosing Diesel Exhaust Fluid: For best results, use Diesel Exhaust Fluid (GM Part No. 19286291; in Canada 88865751). Be sure that any Diesel Exhaust Fluid you use meets ISO 22241 or displays the API Diesel Exhaust Fluid Certification Mark. How much does DEF cost? DEF is found at most major truck stops, auto parts stores and convenience stores for roughly $2-$3 per gallon. What's the service exhaust light on a 2012 GMC Duramax? 2012 DURAMAX 6.6L HD Diesel Silvardo, DIC warning light came on service exhaust system. Added DEF, message doesn't want to clear....