- Joined
- Jun 24, 2008
- Messages
- 49,076
- Location
- London
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- 2022 Hyundai IONIQ 5 RWD / 2016 Suzuki Vitara AWD
Since 86.2 % of diesel is carbon, getting it build up in engines eventually is pretty inevitable no matter how good the fuel is. My leggy derv has never needed any internal cleaning except the EGR valve...
The detergents in the fuel additive will limit the carbon build-up.
When you say your "leggy derv has never needed any internal cleaning", as per my previous post, carbon build-up reduces engine performance and increases fuel consumption over time, so the term "need" is a subjective one. You seem to accept that your engine is just 'leggy', and that's fine, but some prefer to use additives and keep their engines' performance and fuel efficiency as best as possible.