Quote:
Originally Posted by Autobahnschleicher
I've had to kind of overhaul my Toyotas engine (1ZZ-FED) as well due to excessive oil consumption.
I failed emissions due to the visible cloud coming out of the exaust.
The bores where still in pretty good condition without scratches and an intact cross-hatch pattern, so I just gave them a little hone, new rings and drilled the pistons.
Also:
A big fault was in the oil controll rings and drain holes.
They are both prone to clog up and seize, causing high oil consumption.
Valve stem seals also often go bad, wich increases oul consumption as well.
This results in carbon deposits everywhere.
Had several mm of carbon and ash on my exaust valves, piston crowns and combustion chamber.
Especialy the stuff on the exaust valves is a ***** to clean off, even with a drillpress and wirebrush.
Not sure if the Prius is the same, but I've heared the valve stem issue and oil controll ring issue are typical Toyota problems...
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Thanks! I wasn't aware of the valve stem seals bring an issue on the Toyotas, but that would be an easier thing to reach than the rings.
Yes, I do believe oil control rings are the problem. I theorize it's a combination of small drain back oil holes, at the oil control rings, low tension compression rings and the fact nobody changes their oil as often as they really should. Most owner's manuals have two oil change schedules, and most people do the less often schedule even though their driving almost always fits into the more often oil change schedule.
But there point was I could get an old VW diesel that's in ok condition and probably drive it all over with very few problems that will be very cheap to fix. But I just don't feel that way with newer cars with even just half the mileage.