Why switch to a high mileage oil ?

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Cuz it…

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Joined
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Decatur AL USA
Which manufacturer publishes those numbers ?

Z
It's been the industry standard for years. They design for 150,000 mi service life. I think that's the B10 Life (90% without major repair). Obviously sometimes they fail. Like Honda with the 98-2002 B7XA Automatics. Cars with them definitely exceeded a 10% failure rate. Given the complexity of the job parts have to be overengineered to avoid all the compounding of the odds catching up with you early. Some cars get lucky and survive ridiculous mileage and some don't. This explains though why lubed for lifetime sealed trans and non-serviceable drivelines (integrated ujoints) have become a thing.
 
Joined
May 12, 2018
Messages
323
Location
CA
It's been the industry standard for years. They design for 150,000 mi service life. I think that's the B10 Life (90% without major repair). Obviously sometimes they fail. Like Honda with the 98-2002 B7XA Automatics. Cars with them definitely exceeded a 10% failure rate. Given the complexity of the job parts have to be overengineered to avoid all the compounding of the odds catching up with you early. Some cars get lucky and survive ridiculous mileage and some don't. This explains though why lubed for lifetime sealed trans and non-serviceable drivelines (integrated ujoints) have become a thing.
Is that so…?

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Joined
Jan 25, 2003
Messages
5,354
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Decatur AL USA
I'm sure glad no one told me or any of my cars that.
Yes we routinely have cars last beyond their designed lifespan. I'm just saying they didn't pick 75,000 out of the ether. It's half the B10 (90% of vehicles without a major repair). Now the new 150,000 HM we can argue about whether they simply doubled the regular HM or based it on being on "borrowed time".
 
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