Halderman:
As you may be aware, older engines that had turbochargers were known for cooking the oil (turning it to tar) and it was advised to keep the engine running at idle speed for about a minute if it had been accelerated rapidly. Today several things have changed, including:
1. The turbocharger bearings are now cooled by coolant being circulated around the bushings as well as cooled and lubricated by the engine oil (this was not the case in older turbocharged engines).
2. The oil specified today, such as dexos, is designed to meet the needs of turbocharged engines. While dexos oil specifications do not indicate which base oil is used, it almost HAS to be a synthetic. There are three groups of synthetics (Group II, IV and V), and I believe that the specified oil has to use at least a Group III base stock. See the “Engine Oil Update” PowerPoint on my website. Go to www.jameshalderman.com, click on “Jim’s Stuff” and click on “Conference Power Points” and select “Engine Oil Update.”
I think that Alfa Romeo is being very conservative and want to make sure that the turbocharger bushings are kept lubricated under all conditions. As always, vehicle owners should always follow the manufacturers’ recommended products such as engine oil and coolant, and maintenance intervals. I hope this helps.
Have an automotive question? Please write to Jim with your questions at jim@jameshalderman.com.
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