GotQuestions? Lubricants

Q. There used to be a popular idea that the brand of oil used in an engine should not be changed. Is there any truth at all to this?

How about if you change from regular to synthetic? Can a person just experiment with oils to see which one works best? How about mixing them? By that I mean using an odd brand in a pinch when you can't find the one that's in your crankcase?

July 31, 2013

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A. It’s perfectly fine to change brands of oil – the engine doesn’t care.

It is also completely fine to change from conventional oils to synthetics. However, if you need to mix the two, you will not get the full benefits of the synthetic oil.

As for the product that works best, feel free to experiment. Just make sure to establish / identify what it is that you are actually looking for so, so you can make accurate comparisons.



  1. 1. Larry Engle [ May 01, 2014 @ 08:37AM ]

    I believe the origin of this myth is rooted in the issues that occurred 60-70 years ago when users would convert thier engines from the previously more common "non-detergent" oils to "detergent" oils. The story is that the detergents would loosen up previosly solid gunk with the result being plugged oil rifles.

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Author Bio

Mark Betner

Lubricants Expert

CITGO Lubricants

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Mark's 30 years of experience in heavy duty lubricants and member access to the Truck Maintenance Council and the Society of Tribologists and Lubricants Engineers make him a great resource.


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