Any 40wt oil noack < 4 ?

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Thanks for any input.
I want to blend with pp 10w30 for little heavier oil.
Can be conventional oil.
 
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I've used Amsoil's 10W40 ASF (NOACK:3.7) in my oil-burning B&S mower. Oil consumption is significantly reduced compared to Penzoil conventional.
 
That's going to be tough to find. Lowest I have seen is Amsoil 10w30, one of the stoutest oils available -- actually a straight 30 that passes the 10w testing -- and that is at 5.3 NOACK.
 
Chevrons base conventional oil for 40wt or so has noack around 2. Hoping to get some info on sae 40 type oils since they dont publish noack.
 
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