[QUOTE=Formulajones;5695673]Adam,
The lower the number the better. I do know that high ash content tends to create more sludge build up over time so it's definitely a number to pay attention to, especially if you extend your oil change intervals.
I don't see Brad Penn on that list, and I know that is also an excellent oil with low ash and good pour qualities.]
Speaking of ash and sludge, back in the '60's and '70's, ash was a concern as it could really foul plugs if burned and no one wanted sludge buildup. Back then Quaker State was reputed to be sludgiest. The lowest ash oil was Valvoline made from Kentucky oil stock back then = racer's choice.
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"No replacement for displacement!"
GTOAA--https://www.gtoaa.org/
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