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I've been a Toyota tech. since I graduated high school(1985). I have heard alot of theories as to why a particular Toyota has an oil consumption problem and I can't make a blanket about all Toyotas but after rebuilding alot of them I can comment on what I have found.
1.Toyotas don't have problems per say with cylinder wear or distortion. I have rebuilt MANY with over 200K that had absolutely no ridge in the cylinder or out-of-round.
2.Toyotas generally are not pickey about wanting a particular brand of oil. Too many success stories with X brand of oil.
3.The #1 oil consumption problem I have seen with them is gummed-up oil control rings. I've never had a Toyota come back with a consumption problem that I re-ringed using aftermarket rings. The ring design Toyota uses is very sensitive to deposits. I don't claim to know why but I have pulled many pistons out and the oil-control rings would be hopelessly gummed up. Perhaps useing a cleaner like AutoRx can help.
4.We all know about the quote "sludge monster" engines that they built.I don't have a flame-suit on so I won't go there on that subject but I will say I've seen customers that were sticklers about oil maintenance that got many miles out of them.
5.I have never used AutoRx so I can't testify to it's effectiveness. If it works I would say try it in your Toyota and if consumption decreases or stops you know you have oil ring deposits. No amount of detergent would help distorted or worn cylinders.
I paid 100$ for a Corolla that had 165K miles on it. It drank oil like Fred Sanford drank Ripple. I pulled the engine down, honed the cylinders,put a set of aftermarket rings in it and threw it back together for about 250$ in parts. It is the family kick-around car and uses NO oil running 5K intervals on Schaeffer 5W30.
I am sure someone may have a different view on this and perhaps you have insight as to why SOME Toyotas have this problem. I am simply relating my experience with rebuilding many of these engines.
Choose a good brand of oil;be consistant with changing it;and if a detergent additive is proven to work use it and your oil rings will thank you.