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Unread 04-17-2008, 09:52 PM   #1
skfullen
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Mixing different brands of oil

My brother inherited quite a collection of oil from a family member on his wife's side of the family. After the gentlemen passed and the family went to clean out the garage, they found shelves of various brands of oil in small lots. He tells me he has Quaker State, Penzoil, Castrol, Mobil One, Valvoline, Walmart SuperTech, Havoline, etc, in lots of 3 or 4 quarts. Some of it is dyno oil, and a small amount is synthetic. All of it is the same weight - 5w/30. I guess the old gentleman bought oil on sale and ended up with the various brands.

My brother wants to know if it is safe to mix the oil for a 6 quart oil change in his Ford F-150, and which is the best way to do it. He says that he has about 30 quarts of the 5w30 and wants to know whether to mix it all together at once and use it 6 quarts at at a time or try to mix as few brands as possible for each oil change.

Honestly, I would be a little concerned about doing this with a "newer" vehicle, but this is an F-150 with over 125,000 miles on it. It is the same weight oil he has been running in the Ford for years. What do you think? Would you do it?

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Unread 04-17-2008, 09:59 PM   #2
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You gotta think. The oil you get from your basic Fly By Night oil and lube shop is recycled oil, that's just a mishmash of everything that has been drained and rehashed.
I can't see a problem with doing it, hell even mixing the synth with the other can't hurt as far as I can tell.
Just pour them in the crank case.
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Unread 04-18-2008, 12:08 AM   #3
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Unread 04-18-2008, 05:20 AM   #4
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I highly doubt that the name on the bottle will have any effect on the oil. I wouldnt want to mix synthetic with regular though.
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Unread 04-18-2008, 06:27 AM   #5
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Do not mix the different brands of oil. They have a catalyst in them that will cause the motor to heat up to normal operating temperature, the tires will rotate while driving at a high rate of speed. The scary part is that the front tires will turn right and left as the steering wheel is moved right and left. It will burn gas when it is running and you know how expensive gas is. If it were me I would tell my friend only use that oil if he wants his truck to act the same way it does now.

The only thing he should pay attention to don't use it if it has been opened. It may be contaminated and cause damage, but if it hasn't been opened it should be ok.

What about saving it and using it as an accelerant for burning down houses.
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Unread 04-18-2008, 12:13 PM   #6
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Quote:
Originally Posted by EJames1226 View Post
I wouldnt want to mix synthetic with regular though.
They are absolutely 100% compatible and can be mixed without problem. In other words, it would't create a problem... lots of motor oils are mixes of synthetic and mineral-based oils.
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Unread 04-18-2008, 12:23 PM   #7
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Not only would I do it, I have done it and will continue to do it. I don't mix different weights, but brand to me is irrelevant.

When you drain the oil from your vehicle, you're not getting it all out anyway. You are mixing oils everytime you re-fill the crankcase.
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Unread 04-18-2008, 01:27 PM   #8
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A few points worth noting:

All motor oils, including synthetic, have a shelf life. (most are 5 years).

The API standards change regularly and older oils may not meet the latest engine warranty requirement.

The oil’s technical data sheets shows the oil’s properties, e.g., flash point, pour point, API gravity, viscosity, etc. Different brand oils most likely will have different properties.

Quote from Exxon/Mobil site: “we would not recommend mixing oils as a general practice because oils are complex mixtures of additives and base oils that can be destabilized.”

Would I mix different brands of oils OF THE SAME VISCOSITY in an older vehicle? Yes.

Would I do the same in a newer vehicle? No
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Unread 04-18-2008, 08:25 PM   #9
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ya gotta think about this one...ther'es only 3 processing plants in the us. so that means that there's only 3 'name brands' of oil...no matter how many official brands there are.

penzoil/quaker
exxon/mobil
and i think sonoco...not sure on the last...???

any way. every other 'name brand' is a bought and paid for penz/mobil/sonoco mixture of some sort.

now...house brands like o'riely's and advance's brands are mostly filtered and purified used oils. if you wanna use used oil go ahead. but i wont. i'll stick with my valvoline and be happy.
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Unread 04-19-2008, 10:39 AM   #10
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Quote:
Originally Posted by edzakory View Post
Would I mix different brands of oils OF THE SAME VISCOSITY in an older vehicle? Yes.

Would I do the same in a newer vehicle? No
It doesn't hurt to mix viscosities either. If I used 10W-30 and found I was down a quart and I couldn't find a quart of 10W-30, I wouldn't hesitate to add a quart of something like 5W-30, 10w-40, 30 weight, 40 weight, etc.. Dino or Synthetic, it won't hurt at all.
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Unread 04-19-2008, 11:32 AM   #11
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Quote:
Originally Posted by skfullen View Post
My brother wants to know if it is safe to mix the oil for a 6 quart oil change in his Ford F-150
Well there ya go, it's a Ford so even if it hurts it, who cares??


j/k -- I don't mix brands, but as others have said, I doubt it would hurt anything. Given all that free oil, I would make use of it. Especially in a Ford.
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Unread 09-27-2008, 10:48 PM   #12
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Well, I've been mixing brands my own-self for while with no problems. I just make sure to keep viscocity the same.
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Unread 09-28-2008, 04:11 AM   #13
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Quote:
Originally Posted by skfullen View Post
Well, I've been mixing brands my own-self for while with no problems. I just make sure to keep viscocity the same.
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Unread 09-28-2008, 06:50 AM   #14
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If you're worried about mixing the oil just keep it in your garage and use it to flush the engine occasionally. When my dad passed away I inherited some straight 30W oil he used in his terrible 80's GM diesels. Twice a year when I do an O/C I fill it wit the 30W and run it for a few minutes then drain and refill w/the new stuff. The new stuff will stay clean for up to three months doing this. I just figured it was a waste of oil to dump it and I can't hurt the motor just running it for a few minutes.
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Unread 10-10-2008, 09:55 PM   #15
skfullen
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Thanks for all the replies.


Just noticed I was starting to collect small lots of different brands and weights in my own garage.
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