Ya we used the GM A/C brand. Almost twice as much but common on 5.3 motors. to go bad fast. I'm an old school motor guy and builder, my son did the GXP for himself, We did cam, headers rockers, delete the 4 cylinder mode, different intake etc. We also built a bullletproof trans for the car which was the original problem. The car is a nightmare to work on, but super fast. We changed out every part when the motor and trans were out. and I mean every line, hose or sensor. The only one we didn't change was the oil pressure sensor because in was in a spot you could get to easy and it worked before the build. It didn't after for no reason at all.. I don't know if you know this, but one of the knock senors is behind the transmission tailshaft, if it goes bad you will need to pull the trans to get to it, LOL
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