Oil consumption, P1121 at 97K, what else do I need to service

Oil consumption increases with engine rpm. I would guess that the 1.5L engine is running at 3500 rpm or higher when you're driving at 85 to 88 mph (assuming a level, dry surface with minimal cross or headwinds).

But a quart every 800 miles is excessive for a Prius even at 88 mph, which indicates something's not right. None of what you listed
except the spark plugs and engine air filter would have any effect on the OC.

 

change the PVC valve ..theres youtube videos on how to change it and where it is..as they get older they all burn oil..mine goes through a qt every 2000 miles

 

I don’t think the trans fluid needs changing if its only 40t miles old.
Bough coolants could be changed. Engine coolant can easily be changed while replacing coolant control valve. System is super hard to bled…
No need to change mechanical pump that’s not leaking.
Check that you didn’t put belt on too tight. It happens very easy. If belt is too tight it will wear the water pump fast.
Valves should not need adjustment. Adjustment is only made if they are noisy. Adjustment is complicated proses.
You should clean the battery fan if you don’t know how dirty it is.

 

You should also do a leak down test. It's the opposite of the compression test.

 

That is a bad idea. After such a long service life, the coolant should be replaced. The idea is to replace it before it starts looking nasty.

Get Mini VCI.

 

Too early for the spark plugs, manual says replace at 120k.

 

if you think about it these motors should not be burning oil until about 250,000 miles because they don't run all the time like a normal car..lets say you have 100,000 miles on your prius and its burning a qt between changes the motor might have 65,000 miles (just a guess as to the %) so the motor is worn out sooner then a regular car..but the prius will hit 250,000 miles where the same motor in another model will not...its a trade off I guess..

 

My 2004 has 205K miles on the odometer and the oil consumption rate is ~ 1 quart per 2,000 miles. It has been consuming oil at a noticeable rate since ~80K miles. Clearly at higher engine speeds the oil consumption rate will increase.

I disagree with the concept that just because the Prius engine does not run all of the time, that therefore fewer effective miles are logged. The miles traveled on electric power are not free. The gasoline engine has to produce the power which brings the car to a higher elevation so that as the car moves down to a lower elevation, regenerative power is available. Alternatively, the gasoline engine has to produce the power which recharges the traction battery, to the extent that regen braking is insufficient.

Compared to a "normal" car, the Prius engine size is small for the size of the vehicle. The Prius engine displacement is 1.5L (1.8L for 3G) compared to other cars which might have a 2L to 3L engine installed. Hence the Prius engine is working harder when it is on.

 

The Prius engine is also subject to greater wear than an engine in a conventional gasoline or diesel powered vehicle in that the more miles it accumulates, the more start-stop cycles it amasses. Prius taxis used in large cities typically have the most start-stop cycles - lots of starts and stops in heavy city traffic. Start-stop cycles primarily cause surface to surface wear: crankshaft and connecting rod bearings, piston ring peripheral surfaces, etc. And once wear occurs, oil consumption should be an inevitable consequence.

 

Startup wear occurs because there is no oil left on the components, and it takes a few seconds for the oil pump to get the oil through the engine. Taxis will only have one of these cold starts each day.

They do run less than a standard car, but not that much less. Even in city driving - when you are moving the engine is running (excluding the plug ins). The standard cars around you are running at the stoplights but at a low rpm. When the Prii is running its average rpm is higher.

 

You can be moving and the engine is not running, quite a bit actually.

 

Depends on the model. If you are going to keep up with traffic in any Gen 2 the engine will be running. Plug-in Gen 3, sure (as I said in my prior reply).

 

I used to drive the GM diesel cars back in the 80s- a common complaint was hard stating caused by low compression on an engine with over 80,000 miles or so. GM sold a special additive that you added to each cylinder, by removing a glow plug. The additive helped removed the carbon that built up on the piston rings, which caused them to stick in the groove, which lowered compression and caused more blow by, which caused even more carbon build up. I used the additive at least once on every car I owned. The engine would blow white smoke out the tailpipe as the carbon burned out of the cylinder. Not having seen a Prius engine tear down on an oil burning engine, I can't comment of the possibility of normal ring wear vs, stuck piston rings from carbon build ups. My 07 Prius had a little over 90,000 miles on it when I traded it and the oil at 5000 miles still looked clean and was down no more than 1/2 quart. On the last year of service I had at Toyota in 2013, they used a different bulk oil on the oil change (spec'd for the Gen 3 model ?)- I asked why it was different that the previously recommended oil weight and was assured that it was fine for the older Prius- but I had my doubts