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Old 16-04-2016   #16
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Re: Fiat 500c 0.9 Twin-air turbocharger problem

I've been using Shell Nitro diesel in my Saab now for almost two years. No issues with regens, smoke analyser readings at MOT time, virtually non existent.

The petrol TA engine probably needs far more care than a more standard petrol engine, it's just a pita with the oil filter situation where you have to use diagnostics to reset the oil change interval etc and of course, highly recommended to use only genuine Fiat oil filters.
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Old 17-04-2016   #17
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Re: Fiat 500c 0.9 Twin-air turbocharger problem

@500RJ - What is known of this vehicle's service history?

That said- black carbon deposits in the turbo oil feed (upstream or downstream of the turbo? Have you checked both sides?) sounds like the classic symptoms of an engine switched off with a red hot turbo.

My opinions on the 18k oil change regime for the twinair (and other engines) is well known- now twinairs are making their way towards the higher-mileage used car market I hope this does not become common.
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Old 17-04-2016   #18
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Re: Fiat 500c 0.9 Twin-air turbocharger problem

Using the correct grade C3 oil is also important - my TA gets new oil annually, which has averaged at every 8000 miles over 5 years.
18000 mile service intervals are also thought to be a contributing factor to the many cam chain failures in VAG engines - they have now gone to a cam belt.
Also, its quite common for people who have had a turbo failure to have the replacement fail after not many miles. The oil feed pipes should be cleaned out or replaced with the turbo, but apparently not all garages do this.
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