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Chevrolet Silverado 2500HD Diesel Smog Check?

Why does the DMV want my a smog check on my Deramax Diesel before there are any problems? The truck runs great and is well maintained. Is this a way for California to rob again?
Answer:

California has been requiring diesel vehicle obtain smog certification since 2010. Diesel vehicles which require smog inspections include: all diesel trucks and diesel passenger cars which are 1998 model year or newer, and weight 14,000 GVWR or under. These diesel vehicle must undergo a biennial smog inspection similar to their gasoline counterparts.

The diesel smog check was introduced in order to facilitate smog emission reduction. Please read more information regarding diesel smog inspection here.

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