Thursday, January 7, 2010

Putting in different brands of motor oil in a car, will that effect engine performance?

Does it matter which motor oil brand to buy-Mobil, quaker state....Putting in different brands of motor oil in a car, will that effect engine performance?
In an emergency situation, it is more important to have oil than to worry about mixing brands. Outside of that, the general rule of thumb is not to do so, because difference companies use different additive chemistries, and those chemistries *might* react badly. This was much more of an issue 20 or 30 years ago. Nowadays, getting an API service rating SM, you'd have to be a magician to use different additives from everyone else, so the difference is mostly in tweaking the amounts of additives. Not saying they are all the same, just less of an issue than it once was, and you should still try to choose a brand and stick to it. As another answer noted, if you want to change brands, do so at oil change time.





Oh, it is OK to mix synthetic and mineral oil, or synth-blends: a synth blend *is* a mix of synthetic and mineral. Just try to keep it in the same brand family.





Also, mixing grades of oil is not a big deal, just make sure you use the grade oil recommended by the engineers who designed the engine, not some weekend mechanic who has dispensed the same advice for 40 years. Engines have changed, and the engineers know the tolerances of the engine better than the mechanics...at least for the first 100,000 miles...Putting in different brands of motor oil in a car, will that effect engine performance?
Different brands of oil will not affect the performance, but it best not to mix normal oil with synthetic. Also make sure you put in the correct grade of oil to suit your engine.
Don't mix different types - ie


Don't mix mineral oil with synthetic or semi-synthetic.


Don't mix Duckhams with anything else.





Usually mixing different brands of the same type and spec will be OK.
No, switching brands when doing oil changes is fine. The only no-no I've been told is not to mix different viscosities (doing so changes it) even though I've read (somewhere else) some people do it.
dont matter what brand and most of time dont matter what weight.. i use 10w40 with all my cars have since the 70's

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