cSt question for the math whiz pls

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Jul 12, 2006
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my truck calls for 7 quarts of 5w-20. the motor oil i'm using at the moment has this product spec: 8.65 @100 cSt, 46.96 @40cSt. i'm going to add 16 ounces (half quart) of CD-2 Street Legal Oil Booster (35.0 @100 cSt) every oil change. so that would be 6 1/2 quarts of 5w-20 & half quart of CD-2 Street Legal Oil Booster. could someone please tell me what's going to be the end cSt @100 celcius? thanks!
 
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Using simple ratios for the calculation, 10.53 cSt. Reality won't be exactly the same, but close enough.
 
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