Could be head gasket leak. Open the radiator reservoir cap. View the light reflected in the coolant. Is there a rainbow coloured oil slick floating on top of the water?
Remove oil filler cap and oil dipstick. Any signs of a creamy emulsion?
Look for smoke and steam coming out of the exhaust.
Run an engine compression test.
I don't know about PT 20 oil but a turbo runs at high temperatures, ordinary oil breaks down and fails to protect the engine. Turbo engines need synthetic oil which can maintain its molecular structure under heat and load. Shell synthetic is a good choice.
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