i have a 1997 Chevy 3500 dually with a 6.5 turbo diesel and i need to change the engine oil cooler lines because they are leaking. i have not owned a diesel until now so my knowledge is limited. can any one tell me the procedure for removing and replacing these lines? they appear to have a screw in adapter that the lines snap lock into at the engine block. i don't know if i should remove them at the adapter or try to unlock them at the snap lock. also is there enough room between the lines and the exhaust to get them off?