sea foam is what i use all the time on a number of cars, euro 4 euro 5 euro6 emissions cars in the EU are designed to collect as much carbon within the oil and engine etc untill around 75k where the carbon beats them it would seem, ie diesels dpf filters and egr valves clog up or petrols the running the oil with carbon build up wears the internals like timing chains faster than a clean oil engine,, this all said seafoam melts the carbon and removes it very well even cleans fuel system on diesels etc, every other oil change
below link for info, i dont support some peoples foolish way of pouring it in to the inlet of any engine, but used as oil additive 50 miles before service works a treat, have used it for 20 years now seen engines after wards change a lot no more ticking or breathing heavy when its dirt causing the problem and not wear,, a support person would think it would cure a worn out engine as nothing will except a rebuilt engine. they also do a inlet spray that will if used once a moth clear carbon and prevent it on rears of inlet valves on turbo engines,,
https://seafoamsales.com/
