Blake Griffin -- Rollin' in $140K Benz ... But Where's the Kia?

Blake Griffin Rollin' in $140K Benz ... But WHERE's the Kia?

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Blake Griffin escorted a hot blonde to his awesome ride -- totally fit for the superstar of the NBA's best team -- only issue is the car they got into ... is NOT made by the company paying Blake a fat endorsement deal.

The Los Angeles Clippers' human dunk machine slipped into a Mercedes-Benz S63 AMG -- a pimp sled for sure, which retails for about $140,000.

However, anyone who's watched an NBA game this season has seen Blake's hysterical Kia Optima commercials where he travels back in time to tell his young self how awesome the Optima is.

Now, let's be real for a sec -- Blake just signed an estimated $95 million deal with the Clips ... so it would be shocking to see him squeeze into an Optima in real life.

Still, Kia is paying him to pump up their product. Think about it ... ever seen Michael Jordan in an Adidas track suit?

So, we gotta ask ...