High Mileage Oil?

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You mean you guys actually flush the ATF too? Daaaaaaaaanngg
 
I'm just going to leave this here...


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Running M1 high mileage 5w-30, I get 16 - 17 mpg on the freeway in NY on 89 octane. Went about 330-340 miles before filling with about 19 gallons.
 
Running M1 high mileage 5w-30, I get 16 - 17 mpg on the freeway in NY on 89 octane. Went about 330-340 miles before filling with about 19 gallons.

I run 5w-40 and I've been told I have my crankcase overfilled by 3qts.
 
Running M1 high mileage 5w-30, I get 16 - 17 mpg on the freeway in NY on 89 octane. Went about 330-340 miles before filling with about 19 gallons.

I run the same and get 13 mpg in the highway, 10 in the city. Not a lot, but I enjoy every single one of them.
 
You have to change the oil? ;-)
 
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I’ve heard some good things about Valvoline Restore and Protect. Anyone familiar with this oil and Is it going to swell seals up like high mileage oil does?
 
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