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Tim, I was thinking since the turbo is heating up the motor oil when the EGT's go up. Maybe adding a extra oil cooler could remove the excess heat from the oil. A cooler along with the rad oil cooler might be enough. The hotter oil is most likely heating up the coolant since it is on the cool...

I used header wrap on the crossover pipe to the turbo. On my 82 GMC with a 6.2 and a banks. The lower rad hose is right up aginst it. I believe it was preheating the coolant. Mine does have a heat shield there but the shield gets so hot that I didn't think it helped much. With the wrap you can...

Ive got a 1995 2Door 4X4 youkon with a 6.5 turbo that might make a good doner.