Read GM service bulletin TSB# 10-06-01-008M:I’ve posted a couple of threads about my 2009 Scion with the oil burning 2az-fe engine so I won’t elaborate here and just jump straight to the question. What oil and change interval would you use if you were trying to flush out your oil control rings? I was thinking a synthetic 0w-20, but that’s mostly because I have a few bottles of Harvest King I don‘t need. Maybe a couple of 2000 mile changes and then reasses?
The engine specifies 5w-20 or 0w-20. I know Royal Purple has a lot of detergents so maybe a jug of it to start?
Check out the VOAIt should be, since it's called Ultraclean
How does a VOA show an oil has better cleaning vs not?Check out the VOA
That’s a few years old but if it’s still the same it looks impressive.Here is the VOA of Castrol's new GTX Ultraclean 5w30 oil. I believe they have added group III to this as the technical data sheet now says "synthetic blend". It looks very close to the older GTX formulation if not a little thicker viscosity. I know that PQIA hasn't tested this oil yet, but...bobistheoilguy.com
Detergents don't really "clean", their forte is keeping things clean by neutralizing acids and preventing particulate and contaminants from plating out. They work with dispersants, which prevent agglomeration, which of course can also lead to them falling out of suspension.For me it was the high Calcium levels. Calcium is a detergent. Typically it's around 1200ppm but in the Ultraclean VOA it's 2451.
Okay, cool. Good to know.Detergents don't really "clean", their forte is keeping things clean by neutralizing acids and preventing particulate and contaminants from plating out. They work with dispersants, which prevent agglomeration, which of course can also lead to them falling out of suspension.
For actual cleaning, you need AN's or esters; something polar that can actively work to free deposits from surfaces.
Right, but you can't see any of the base oil blend.Okay, cool. Good to know.
So let me rephrase that then. It's called Ultraclean and it advertises: "Its double-action formula has been proven to clean away the sludge that can block engine oilways* and helps prevent new sludge formation". What stands out in its VOA is much higher than normal Calcium, which is a detergent.
Are you a chemist? Your equivocation of two different statements is troublesome to me. OP should try Kreen.
I was a chemist. Your statements were factually wrong, whatever their intentions. That is all. Have a good day.What do you mean? A high based calcium sulfonate detergent additive contains calcium alkylbenzene sulfonate and calcium carbonate basic salt with the formula [R-SO3]2Ca(CaCO3)n. Same with magnesium. The root is the carbonate as the neutralizing agent. My statement is an attempt to simplify the function of the calcium and magnesium that shows up in a VOA/UOA. Perhaps a bit too oversimplified.
I am not a chemist.