ok i think it might be the oil return because now that im looking at it the return line is not as big as the factory one could this be the problem would this cause the oil to come out the seals. also how much pressure is in the return line. i used oil line that was like 3/8 was this to small should i get the factory oil return for the t25 also this is on my 420a. if i put a bigger size hose what should it be and will this stop my problems. the turbo was rebuild not to long ago and when it came to me it looked fairly new. becasue of the oil coming back trew the orings has this messed them up?