High Mileage oils

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So what makes a high mileage oil different? From Pennzoil/Chevron data sheets, the high temp viscosity is about halfway up to the next grade. So if I want a 10w-30 high mileage oil change I use 3qt 10w-30 and 2qt 10w-40 regular oils, and I don't pay an extra 50 cents per quart. What else am I missing?
 
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Originally posted by lamont cranston: What else am I missing?
HM oils typically have higher detergent levels, more AW/EP additives, and esters to condition old seals. They also are blended from heavier stock, hence they have less VI improvers.
 
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