If turbocharger oil flow is restricted over longer periods the turbocharger bearing system will show signs of heat discoloration as well as polished and burnished surfaces. This type of failure is commonly known as oil starvation.

	Insufficient oil supply can be attributed to the following:
	• Re-fitting a turbocharger without adequate priming.
	• Long periods of non-use.
	• Broken or restricted oil feed pipe.
	• Low engine oil pressure due to malfunctioning lubrication system.
	• Low or no oil in sump.
	• The use of sealants can result in restricting the oil flow.

Examples of oil starvation     Do not use silicone sealants   Insufficient lubrication oil