Porsche issued warning on Paul Walker’s death car

The sports car Paul Walker died in was so gnarly to drive … Porsche WARNED its dealers, in writing, about letting just anyone drive the vehicle … because it’s hyper sensitive to road conditions.

TMZ obtained a copy of a memo sent from Porsche HQ to multiple dealers in the Midwest back in 2004 … right before the $500K Carrera GT went on sale — and it explains how ridiculously powerful the car is, but also that … “this vehicle cannot drive over a Foster Beer can that is lying on its side."

In the doc, a Porsche exec says, “You need to be aware of what type of road surface you are on (dips; pot holes, seam heights, etc.)"

It’s worth noting … the road where Paul and Roger Rodas crashed is covered with reflective dots — y’know, the ones you’ve probably driven over harmlessly thousands of times.

Police are still investigating the exact cause of the accident, and, so far, have only said speed was a factor.

The exec’s memo explains the GT is damn near to being a real racecar, but adds … "This car has all the disadvantages of a racecar."

While Rodas was known to be an experienced driver — the Porsche document makes it clear experience isn’t always enough … if the road surface isn’t ideal. TMZ