Originally Posted By: Danh
Originally Posted By: andyd
In the norm, from reading UOAs, fuel < 1%. Fuel dilution was a major deal with carbs and chokes. In a modern car, its a non-problem.
You're likely reading UOAs from Blackstone, which are not reliable for gauging fuel dilution. Look at Oil Analyzers/Polaris UOAs instead, which uses gas chromotography for this purpose. On Blackstone UOAs ignore fuel dilution and look at viscosity instead: you'll see lots of samples below or nearly below grade.
Fuel dilution is an issue withnDI/TGDI engines; the question is how harmful it is. But when you hear reports of increasing sump levels it can't be a non-problem.
Why not? Increasing to what level? Slight increases aren’t any cause for concern-just like normal slight overfills aren’t, but I’ve yet to see any pictures of major increases in overall sump volume reported here.