I would highly recommend Terraclean rather than these fuel additives every now and again, although high-RON petrol all the time is certainly beneficial. £100-£120 for a big engine but produces spectacular noticeable results including a boost of a couple of MPG, even more on smaller engines. Going to get it done in the next couple of weeks as well as new cats on my S8 so should be running beautifully after.
It cleans the injectors up and de-carbonises the engine and kicks 10 years of crap out through the exhaust too!
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Currently '8-less
Previously:
- Aqua Blue Pearl D3 S8 - Kamut Beige leather, ACC, B&O, factory RSE, solar sunroof, electric blinds, ski bag, Homelink, comfort headrests.
- Aqua Blue D2 S8 - Grey leather/Alcantara
- D3 A8 3.0 CVT
- D3 3.7 V8
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