I change oil myself in my vehicles on a regular basis. I buy 10w30 oil by the case when its on sale(name brands only). Over a period of time I end up with 2 1/2qts of different brands. Is it OK to change oil again mixing brands? I grew up being told not too. True or false?

I have never had an drastic negative effects from occasionally mixing brands. I try to use that kind of oil leftovers as make up oil between oil changes, but I have also used all my leftovers in one oil change in one of my older vehicles.

My wife several years ago had a tendency to mix different oil brands and the engine just sludged up. Different manufactures use different amount of detergents and different detergents that may cause this. I do know that with Aircraft engines, reciprocating it was fround on for that reason. Some peo…

Yes. You can mix different brands of oil. They all must meet the minimum requirements set by the American Petroleum Institute and the Society of Automotive Engineers. But it’s probably not a good idea to mix different multi-viscocity weights.

I have done this for years; sometimes mix three different types and weights. Currently in one of our vehicles, I have some 10W-30 of one brand, some 10W-40 of another and some 15W-40 of yet another brand. The 10W-30 is some new oil that I got on sale and want to use up, I have a good supply of the…

Most people don’t even know what brand or weight is currently in their engines. If they are a quart low, they simply buy a can of any 10W-30 and dump it in. If this could cause a problem we all would have heard of it by now. Conclusion: perfectly safe to mix.

I seriously doubt that your wife’s car sludged up because of mixing various oil brands. It was likely her driving style and the oil change interval. All oils have to meet the same number of tough standards and there fore all, but a few, are FULLY COMPATIBLE. Engines sludge up because of too much sh…

Don’t mix conventional (“dinosaur”) and synthetic oils. Keep to the same weight/viscosity (e.g., 10W-30). Stick to the service level (e.g., SF) or higher recommended for your engine. Buy reasonably “name brand” oils you can trust. You’ll be fine.

You can mix conventional and synthetic, thats what synthetic blends are. You can mix different weights but not sure why you would. You can use any API approved oils regardless of brand or price. You can mix the service level as long as all of them meet or exceed the service level recommended for …

This comes from the days when oil came from either Pennsylvania or Oklahoma/Texas. People said you could not mix these two oils. I don’t know if that was really true or not, but it all comes from the middle east now.

I really haven’t heard any negatives of mixing brands if they’re even within the same weight specifications however you shouldn’t be mixing synthetic and conventional oil that can cause some sludge to build on an engine , working on a engine at the shop now bottom end looks good but the heads ,valve…

Mixing oil brands

Maintenance/Repairs

Scrapyard-John April 3, 2019, 12:45am 12

I think you can even mix synthetic and conventional. I’ve done it with no ill effects. I think that’s what a “synthetic blend” is anyway!

My poor Buick gets the leftover oil mix and it doesn’t seem to mind.

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Mixing oil brands

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