GotQuestions? Lubricants

Q. How can a lower viscosity oil still protect my engine?

Isn't thicker better when it comes to long engine life?

April 10, 2013

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A. Lower viscosity oils or oils with a lower W rating such as 10W-30, 5W-40 or 5W-30 can be formulated for both engine durability and fuel economy.

When a low viscosity oil can demonstrate proven engine durability, the benefits of significant fuel savings while sustaining optimum engine life is achievable. However, emphasis needs to be placed on how the oil is formulated and tested. Just lowering the viscosity grade without providing a performance enhancing additive technology could lead to higher engine wear and shortened engine life.


With the push to improve fuel economy, the unknowing consumer may be inclined just to listen to the fuel-saving message and not check out product performance support behind the claims.

Overall, properly designed, low viscosity heavy-duty engine oils can provide fuel savings, reduce cold engine cranking with reduced dependency on energy consuming block heaters, and improved battery and starter life, reduce cold weather start wear and superior high temperature performance.


  1. 1. willie essary [ May 02, 2013 @ 07:38AM ]

    does royal purple meet these standards purtection.

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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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