I just purchased a Sierra crew 5.3 SLT. Wanted black, and only 6.2 was white. I drove the 6.2 first, and the 5.3 second. I really couldn't tell a difference between the two. I figured something changes maybe computer wise after some miles are put on them. I had a black Silverado Z71 RST 6.2 ordered with a build date of first week of April, and it was never going to be built... But I sure like all the features this truck came with....