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Old 04-18-2023, 03:52 PM   #1
JParsons
 
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will oil in the gas harm fuel system

I have about a half-gallon of ethanol-free gas that contains a 1:50 admixture of 2-cycle oil. (It was for an outboard motor I no longer have.) No one will take it off my hands. Would it be a mistake to pour it into a near-full tank of regular gas in my Yaris? I've done that in the past with no obvious ill effects, but I'm getting more wary of taking chances on fouling up the injectors or other fuel system elements.

All replies will be appreciated, but thanks for withholding your opinions on my intelligence!
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Old 04-18-2023, 04:02 PM   #2
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good way to blow your o2 sensors, no seriously the o2 sensors are sensitive and not cheep.....

im sure the oil wouldnt harm the injectors or pump as it would get washed out pretty fast, but you would be spraying oil into the intake manifold and valves where its just likely to bake on....which wouldnt be good either tho would likely have no long term issues

the other thing to consider is that the engine is going to read off the o2 sensors and try and adjust the tune for it

is a half gal of mix really worth tossing in the tank when a quality replacement o2 sensor is 75 and 170 respectivly....and the cheep ones dont last long and are typicaly DOA
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Old 04-18-2023, 07:14 PM   #3
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How about a half quart each time you fill up.
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Old 04-18-2023, 11:37 PM   #4
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If you just want to get rid of it without spoiling the soil, pour it into some big jar and let it evaporate over a few days.
Or - any lawnmower or chainsaw owner should have no problem in taking this from you and using it.
I would avoid using it in a car.
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Old 04-19-2023, 03:43 AM   #5
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Yeah, do it like one pint at a time with a full tank. You say you have done it before. Not a good habit to be into.
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Old 04-19-2023, 10:38 AM   #6
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Sounds like wise counsel. Thanks!
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Old 04-20-2023, 04:39 PM   #7
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Or use it to start the next bonfire
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Old 04-27-2023, 08:12 AM   #8
esse10
 
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oil mix gas

You could be diminishing the lifespan of your CATALYTIC , O2s and fuel filter.
Just dipose of it properly it's not worth the cost.
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Old 04-27-2023, 09:28 AM   #9
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Quote:
Originally Posted by esse10 View Post
You could be diminishing the lifespan of your CATALYTIC , O2s and fuel filter.
Just dipose of it properly it's not worth the cost.
Yes I would think so. On the other hand my wife’s 2005 Camry with 200,000 miles has been using 2 quarts of oil every 5000 miles for a few years now. So far so good with the catalytic converter!
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Old 04-27-2023, 02:00 PM   #10
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camrys got a MUCH bigger cat at almost 4x the size tho right?...i belive it runs a similar cat to the xb2

the damage to the o2's and cat would be my big worry
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Old 04-27-2023, 02:33 PM   #11
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So far so good. Knock on wood!

Do you know the error codes for the O2 sensor and the cat?
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Old 04-27-2023, 07:47 PM   #12
sh0rtlife
 
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dont quote me on it but i think cat is p0420
and im pretty sure o2 p0138 but i thought there were independent codes for top n bottom

if you do need to replace the o2's dont buy anything but denso....i tryed the cheep route with the xb2 as i have very old high discount comercial account at orielys, thus i could try n return...i tested a handfull of brands all failed either right away or in a few hundred miles...except the denso;s
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Old 04-29-2023, 12:21 AM   #13
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I wouldn't worry about hurting an O2 Sensor with a little amount of oil in the gas like that. By the time it mixes with all of the gas in ur tank which seems to be 10 gallons if kinda full the mixture would turn from 50:1 to more like 25600:1 from my little bit of unknowledgeable guess so 25600 to 1 part oil which is not alot at all worse case it lubes ur fuelpump more also its a half gallon i dont think it would do anything other than make less friction. The last engine I had in my car would take 1 quart of oil every day pretty much. Started spending more on oil than gas for awhile. I still do not have a problem with my from O2 Sensor still the same one from 240k miles ago. If you get a p0420 you can always get rid of it for like 10$ with a capacitor and resistor wired into the O2 Sensor.
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