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?
"I'd love to spit some Beechnut in that dude's eye, and shoot with my old .45. A country boy can survive."
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.
Originally Posted by Mean Max
I think I'll keep the YJ. But can I talk you into taking the wife?
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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.
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.
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.