The relative simplicity of the turbocharge is a precision device which can take a great deal of punishment with a cut-off ot omitted oil feed, and loose fitting and damaged ducting. A dealer should check suspected problems because of the specialized tools and equipment that work with them, however, a home mechanic could examine the connections and linkages to check their security, damage, or apparent faultiness. The sound of any turbocharger is peculiar, and any alteration in the sound level can become a symptom of something wrong. A whistling or high-pitched sound will indicate leaking of inlet air or exhaust gas through the air ducting that passes over the air cleaner to the end connected to the exhaust manifold that has become loose or has been punctured by an object, a low engine power will be an indication that the air ducting between the air cleaner and the connection of the duct to the exhaust manifold has become loose or has been poked by an object. Oil in the intake or exhaust or white exhaust smoke is an indication of a broken internal seal in the turbocharger. Should there be unusual sounds in the turbine region, the ducting may be removed, thus enabling an inspection to be made of the turbine wheel which should turn freely; a binding will show that the cooling oil has become sludged up, or coked due to overheating. Cracks and loose fittings on the exhaust manifold also need to be inspected. Since the turbine can efficiently reach 140000 rPM, any break in the oil supply or pollution to the oil bearing shafts can cause serious damage therefore it should be noted that leaks in the oil return pipe and a blockage that may cost the turbine a significant amount of oil via the turbocharger seals can result in a clear sign of burned oil on the turbine housing. Moreover, whenever changing a large engine bearing, it is always necessary to empty the turbocharger with clean oil.