Yes, the warranty will be void if you do not replace or clean your oil lines. All turbos need oil and if the oil feed line is clogged, it will fail, and FAST! Oil is used to lubricate the bearings as well as to cool the turbo. If the oil return line has any build-up or restrictions in it, the oil will back up into the bearing housing. This will cause the oil to push through the seals into the exhaust or intake making the engine smoke.