I got 5 quarts of different oils, all mobile 1 full synth.

5-20
10-20
10-30

Is it alright if I mix them all, I'm from so cal so it doesn't snow here.

 

No. do not do that.

 

ha i've done it in my old pos truck nothing happened

 

oh god. no.

redneck "quadruple weight" oil FTL.

 

just buy new oil jeez...

 

what are you trying to make a 7.50w-22.50 oil?
i would not do it.
i have done on my pos car and nothing happend, but didnt like it

 

why no, i need a reason...

is it that u dont like it or is it that something bad will happen?

 

I've mixed non-synthetic 5w30 with 10w30 a few times when I was in a pinch. There were no ill effects. I don't really see how there could be -- wouldn't you end up with an oil that is the averaged weight of those mixed together?

 

You could risk them separating, or have weight inconsistencies (gluggy parts and thin parts).

 

correct. Multi weight oils are only a recent invention (in the past 50 years that is). It took a lot of chemical engineering to get 2 different weights of oil to behave as one but retain the properties of both. I wouldn't be pushing my luck with 4 different weights.

 

gay ...

ok then, ima go buy some of thea 15k oil i saw the other day haha.

 

You could do it as long as they are all the same brand, really you want to stay consistant but you would be fine.

 

Try it and see what happens. What do you got to lose, just an engine.

 

Nothing bad will happen if you mix them. I would just buy the right oil though. Ive had my share of oil burning beater engines, and I would always put it whatever i had laying around to top them off. Any oil is better than no oil.

 

Why would it matter what brand they were?

 

yeah, i don't really see a problem doing it either. i've used anything from super tech, mobile 1, penzoil, havoline, castrol. and most at the same time. whatever i can find laying around the garage. lol. it just comes out the tail pipe anyway. lol.

 

Probably wouldn't if you didn't mix them together

 

Different Brands have different formulas but if they are all the same brand they would be very similar, the different weights of oils are very similar. Take for example Castrol has 0-30 oil but in a UOA (used oil analysis) it actually is more similar to a 40 weight oil. The weight of oil used in your or anyones car should be based on owners manuals as well as what type of use you are going to put on the car for example if you are going to road race it or just dd the car, excessive heat can thin oil so you would want to use a higher weight oil but that is all up to the user.
If you want to learn a little more on oil try reading this.

http://www.iwsti.com/forums/2-5-lite...ichat-com.html

 

The viscosity grade (for example, 5W-30) tells you the oil's thickness, or viscosity. A thin oil has a lower number and flows more easily, while thick oils have a higher number and are more resistant to flow. Water has a very low viscosity -- it is thin and flows easily. Honey has a very high viscosity -- it is thick and gooey.

Multi-weight oils (such as 10W-30) are a new invention made possible by adding polymers to oil. The polymers allow the oil to have different weights at different temperatures. The first number indicates the viscosity of the oil at a cold temperature, while the second number indicates the viscosity at operating temperature

so when you go mixing a bunch of different wieghs
they dont mix well enough together. causing your engine to have carbon build up and sludge. not to mention poor oil flow, and bad protection for your bearings and seals

but i dont see anything wrong with changing your oil weight on a worn motor,
generally you dont want to go to thick or thin.
so one grade up from recomended at the most

 

i'm pretty sure it would. that thing has smoked since the day i got it. lo. even when i change the oil, which is pointless anyway, i use the same oil. with in a week, it's about 1/2 quart low. i've parked in the same spot in front of my house since october, no drips. none. i think the head needs a rebuild. but, i sold it, so i don't care anymore. lol.

 

For crying out lound. For the last time the "W" in old does not stand for weight. It stands for winter. You can buy 10-30, 10-40, 10-20, and so on with no "W" meaning its for summer. The winter oil is a lil thiner viscosity for warming up and spreading quicker when its cold.

 

can any of these claims of "incompatibility" be backed up? is anyone a lubricants industry professional?

seriously. not being antagonistic.

 

i would like to see some proof also. i mean, its one thing to hear, "my buddys car ****ed up" or mine doesn't run right. well, i've owned over 30 different vehicles since i started to drive, and honestly, i don't have an oil preference. to me oil is oil. i've never had any better luck with one more so than another.

 

Become a member on bobistheoilguy.com forums and search. You will see guys mixing all kinds of oil together with used oil analysis afterwards.

 

honestly, like the last 4 people said, does anyone have real proof?

this will not work then? i want to see a link to an article or something credible