Originally Posted By: JLTD
Originally Posted By: Ducked
Originally Posted By: JLTD
None I suspect, since the injectors are after the valves....
GDI deposits are due to recirculated blowby from the crankcase ventilation system, so it seems reasonable to think fuel composition might make some difference.
Since ethanol is a small volatile molecule I'd guess E85 would either be the same or very slightly better, but I don't know.
Of course they are...you are missing the point that there is no spray of fuel to keep the valves clean; there will be the same levels of blow by and byproducts of combustion...those contaminants remain the same.
I dont, of course, know what you know, but I do know what I don't know.
I dont know "those contaminants remain the same."
I'd expect the "blow by and by products of combustion" to be slightly different, because combustion will be affected by the nature of the fuel, and blowby is likely to include some unburned fuel.
If there is fuel dilution of the oil (and I think there will always be some) then the carry over of light fractions of the oil into the intake tract may be affected by the nature of that fuel.
Such effects may not be detectable, but I dont know of any reason to deny their possibility.