Sulphated ash & U.S. cars clarification?

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Dec 1, 2014
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I'm a little confused about sulphated ash as it relates to U.S. cars.

I know not all oil manufacturers seem to disclose the sulphated ash content of their oils. I'm comparing two (2) different flavors of Ravenol oils which meet my owner's manual specs for my truck (2019 Toyota Tacoma - 3.5L, V-6), one of which lists Sulphated ash (%wt.): 0,79 ( https://bit.ly/3lVRrGf - ILSAC GF-5, API SN (RC), ACEA C5), and the other lists Sulphated ash (%wt.): 0,47 ( https://bit.ly/2PuJg7E - ILSAC GF-5, API SN Plus (RC), ACEA C5).

  1. Out of curiosity, is sulphated ash content something you look for when shopping for oil(s) for your American car/truck?

  2. For U.S. cars, can you make a broad statement and say that the lower the sulphated ash, the better, all other things being equal (or close to it).

Thank you!

Ed
 
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Sulphated ash is a byproduct from combustion that correlates with the quantity of certain additives. The amount of ash is a concern with regards to the service life of emission system components such as diesel particulate filters (DPF) , gas particulate filters (Europe), and catalytic converters.

Unless you're driving a diesel its not an issue for you.
 
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Ed_Flecko

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Sulphated ash is a byproduct from combustion that correlates with the quantity of certain additives. The amount of ash is a concern with regards to the service life of emission system components such as diesel particulate filters (DPF) , gas particulate filters (Europe), and catalytic converters.

Unless you're driving a diesel its not an issue for you.
So, for American cars with catalytic converters, the lower the oil sulphated ash level...the better?

Ed
 
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In theory yes but in reality I doubt full saps oil is going to do your cat in sooner than low saps

now I take valve deposits are a different debate
 
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