any reason to switch to a HM oil?

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1,153
Location
Washington
My wifes 99 Blazer is ready to hit 75K. I've seen the TV commercials that tell me to switch to a HM oil at 75K. If her Blazer doesn't use or leak oil,or have any other mechanical problems is their a good reason for me to switch from the Chevron Supreme 10-30 I've used for the last few years? I can get the Chevron on sale for less than a $1 a quart,the HM oils are almost double that.
 
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