engine cleaner
Thanks all for your kind comments. For the time being I am going to put a 400ml bottle of Forte Top End treatment in the V90 engine oil when the engine is hot then go for a drive for up to an hour (preferably coinciding with a trip I needed to make anyway!). After that I'll do the same when it has its annual service next April and the oil is changed by the garage (DMW, Merton). I might then try Carlube ATF-U instead to see if there is any noticeable difference in running or tappet noise. I'll let the Forum know how it goes.
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