Quote:
Originally Posted by wmhjr
Buddy of mine has a brand new dmax chevy. He's been told something similar from gm. It is emission related. But it wasn't that he had to drive 55mph, just that he had to drive it to get the EGTs up enough and then use it for an hour or so once every 2-3 weeks.
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Yep, Jeff's is a late 07 and that's when it started according to him. He also mentioned the fluid for GM I believe.
Just to add lots of fuel to the fire....
http://www.chevrolet.com/hd-to-hd-truck-comparison/