I'd have to check my turbo to know for sure the model (All I know is it's an ATS), but when it was on the '86 the valley pan would fill with oil and I couldn't figure out where it was coming from. I found a small leak at the oil supply line into the turbo and fixed that. I still had oil collecting in the valley pan. When I swapped the turbo over to the '85, Punkmechanic and Towcat told me to punch about 5-6 holes into the lower part of the pan. I took a broke 3/8 extension and used the grinder to put a nice sharp point on it and punched about 8 holes in the lower part (I was told more is better than not enough). I was also told not to punch in too deep. I installed a new "drain" hose from the turbo to the valley pan and now no more oil leak. Before it would pool up and then start running down the back of the engine and onto the exhaust, starter, and torque convertor cover. I checked the lower part of the valley pan on the '86 and found that it didn't have any holes added.