Originally Posted By: mkosem
Originally Posted By: rockydee
Originally Posted By: Trav
How about i got more MPG at idle.
Yep some poster actually tried to sell that one based on the cars instant MPG gauge. Why don't you look up who that was and question him about his MPG claims.
Lol is that the same as more mpg coasting with the engine off, then braggin about it? I read some pretty cool stuff here, like driving at 4000 rpm+ for 20 mins or something like that to clean up a DI engine. Tough to do in most areas, and I wouldn't want to do it with an auto trans in a lower gear for that long, but what do I know. lol
Not sure why it would be difficult to hold 4000rpm anywhere that consistent speeds can be maintained, provided the vehicle has some sort of gear selector.
The 3000rpm (not 4000rpm) carbon deposit removal detail is not a myth, and is actually in patent documentation that VW published (
see here on the US patent site).
--Matt
I'm just stating what I read on bitog, it was 4K or 4K+ not 3K. Holding the legal limit @ 4K with an auto trans in a low gear to keep it legal for 20 mins isn't something I'd want to where I'm living. Seems others felt the same. OTOH holding 3k would be pretty easy.
Oops- it was 4,500 rpm that makes it harder. The quote was in one of the DI threads, I can't find it after closing bitog to let my daughter on the laptop.
Originally Posted By: badtlc
Originally Posted By: Benzadmiral
Is there any accepted preventative for these deposits, other than frequent oil changes with a low-NOACK, carmaker-approved oil?
Yes, keeping the RPMs above 4500 for 20+min every now and again to help prevent and clean.
Prevention is aided with regular injector cleaning, running premium oil and not changing the oil too often.
I think I took this a bit OT. Sorry