As the oil line is critical to the health of the turbo, the oil line should be replaced or at minimum ultrasonically cleaned. This seems to be a particular requirement for the CX7 2.3L. The above outlines some Mazda CX7 turbo problems, and some ways to help prevent the issue re-occurring. Mazda CX7 Turbo Problems and Solutions Nissan Patrol ZD30 GU Garrett Turbocharger Problems and Solutions Nissan Patrol Turbocharged RD28 2.8L Gutless? Land Cruiser 200 Series V8 IHI Turbo Problems and Solutions Oil Catch Can Benefits for Turbocharged Vehicles Turbocharger Electronic Actuator Stepper Motors xDhL2.