Yaris burning oil

[Ramon1691]

Hello my car has about 151000 miles on it I decided to switch to synthetic oil about 2000 miles ago and now is burning oil it was neglected by previous owner now I'm worried can I switch back to conventional? Will it mess anything up? I'm not saying is burning a lot but it is a bit I'm just wondering if is normal? It didn't do it before when I had conventional oil it's a 07 hatch back

[Exiwolfman]

Originally Posted by Ramon1691

Hello my car has about 151000 miles on it I decided to switch to synthetic oil about 2000 miles ago and now is burning oil it was neglected by previous owner now I'm worried can I switch back to conventional? Will it mess anything up? I'm not saying is burning a lot but it is a bit I'm just wondering if is normal? It didn't do it before when I had conventional oil it's a 07 hatch back

you can switch back with no issues , now are you still running 5w30 syn oil?
I switched sometime ago to 5w30 syn oil I use the toyota brand oil manly cos I get it at cost.

[Ramon1691]

Yes I am but I'm going to change it this Tuesday I didn't change the filter last time because it was so tight maybe that's why is burning oil? It didn't do it before with the conventional one

[Ramon1691]

The bastards at big o tires overtight the poor filter

[Exiwolfman]

Originally Posted by Ramon1691

Yes I am but I'm going to change it this Tuesday I didn't change the filter last time because it was so tight maybe that's why is burning oil? It didn't do it before with the conventional one

maybe you just put not enuf in or they got it wrong , I would say do a proper oil change with syn 5w30 and go from there ..it takes 3.5 litters of oil with filter .

[Ramon1691]

So change with the same oil and if it keeps burning it then change back to conventional on next oil change?

[fnkngrv]

You need to change the filter for sure. Also when there are that many miles on an engine you should be doing an engine flush like the one from AMSOIL for example. It has minerals that revitalize all of the seals which helps keep from burning any oil or leaking.

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[alanwagen]

Not a likely problem but a clogged PCV valve can cause more crankcase pressure which in turn could push more oil by the rings. Also if you switch to a High Mileage oil that should help.

[Ramon1691]

So can I go back to regular oil I bought the Mobil one premium oil 5w30 today I also ordered a pcv valve too I don't think it I'll do any harm since I only ran the car with synthetic for 2000 miles I should of never done that with this many miles but I didn't know better

[Ramon1691]

My mechanic said since I put synthetic after those many miles that is normal for it to burn it because it needs to get used to it lol idk whether if there is any truth to that but synth is more expensive and since I didn't have an issue before them regular is better price wise I'm hoping the engine is good from the inside as I stated before it was neglected by the previous owner and I don't see any leaks on the bottom or top of the engine

[Ramon1691]

Also my driving is mainly city to work and college I would say about 10 miles a day or less idk whether that's important to mention I heard that when you drive short distances the engine doesn't fully warm up or some crap like that

[toad]

our 2007 has almost 200,000 miles and has to be given a quart or so every few months. i've run synthetic since the first oil change and religously change oil/filters every 7,500-10,000 miles with the extended drain interval filters from mobil1(and pennzoil platinum 5w-30). i've been told it's normal for them to do this so late in life(it just started within the last 10,000 miles). the engine conditioner idea sounds good, but for now i'm just going to keep an eye on it.

[zoidberg444]

I use 5w30 fully synthetic in mine. As far as I'm aware its never had anything different. Oil changes every 10k.

110k. Mine is burning a litre every 2000 miles or so. I just keep on top of it. Near as I can tell most of the VVTi engines suffer from this oil burning and it will often progress to a litre every 1000 miles. The only thing to do is a quick and dirty engine rebuild. New piston rings, clean the deposits off the valves and pistons, re-lap the valves in and change the valve stem seals.

I've seen a 7AFE on an old Avensis so bad it was burning a litre in around 400 miles.

[tmontague]

If you Yaris is burning a Liter every 1k and you have just over 100k km on it then you need to check your PCV valve. A healthy Toyota engine does not and should not burn through oil at that mileage.

If you had well over 300k km and it had a hard life (traffic, tough climate) then burning that oil would be considered expected.

When my engine gets to that point i'll be tossing in a 2zr but I have 155k km on my engine and zero oil consumption. That is with an engine driven hard but meticulously cared for and 13k km oil change intervals on 0w30 synthetic (as per a used oil analysis).

I don't expect to be seeing any oil consumption until. Well above 250k km.

Remove the PCV valve every oil change and spray it clean with some brake or throttle body cleaner so that it rattles freely when shaken.

[Ramon1691]

Thanks for all your suggestions in so glad I found this forum, I changed my oil today with Mobil 1 conventional oil premium and put a new filter in as I didn't change the filter last time and I replaced the pcv valve see if that helps

[tarkus]

I would recommend you stay with synthetic for future oil changes. If will help reduce further wear on this already heavily used engine.


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[Ramon1691]

TARKUS you think that would help? It does have a lot of miles on it lol everyone says that is k to go from conventional to synthetic as my understanding synthetic does help lubricate the engine better my only concern is that it didn't burn oil before until I decided to switch to synthetic last oil change

[tmontague]

IMO stick with conventional or you're just burning money. In a high mileage vehicle like yours that doesn't see freezing temps there is no benefit. Dyno oil lubricates just as well as conventional in your climate.

I do run syn oil in my Echo that has 380k km on it but that is only in the few crazy cold months during the winter since it doesn't start as smoothly as it once used to. Once the temp rise I go back to conventional. FWIW I do notice slightly more oil loss with the syn oil, and the weight is always 5w30.

It burns about 1L every 1000-1500 km so I don't bother doing oil changes anymore, just the filter.

You may find adding an additive like syn lube or similar helps with the oil burning. It makes a big difference in my Echo, I suppose you could also just run a heavier weight oil as well.

I just find it hard to believe that this amount of oil burning just happened all of a sudden. This point to you needing to check the PCV, that said it could just be a beaten on enigne with failing rings.