Commone questions answered in the article:
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Z. George Zhang, Ph.D. and director of Valvoline Technical International thinks so. He said there are "distinct differences" compared to regular oils.
"Most of the high mileage oil will have a seal conditioner," he said. "Normally they will have more seal conditioners in the formula." But that's not the only difference between them and conventional lubricants.
With elastomers, a fancy name for the rubber materials seals are made from, Zhang said over time certain chemical components can leach out of them. Special conditioning compounds "tend to react with elastomers," replacing what's been lost over time and increasing their sealing abilities. Think of these chemicals as a salve. If your hands are dried out and the skin is cracked you can rejuvenate it with lotion, which restores its flexibility.
"We researched a lot of these chemical compounds that can be used to rejuvenate seals" Zhang said. He also mentioned that seal conditioners help make seals more flexible and can cause them to expand slightly, another thing that helps stop leaks.
When is the time right to start running a high-mileage oil? The folks at Valvoline recommend you make the switch at 75,000 miles. Zhang said "we use 75,000 as a typical reminder," though you can certainly run MaxLife or a similar product beyond that, or even before.
Zhang said "it's really good for high-mileage engines… for when vehicle performance is deteriorating," but it can be used in brand-new cars as well. Added anti-wear and detergent compounds are just as helpful in a factory-fresh vehicle as they are in one that's got 75,000 miles on the clock.
https://www.autoguide.com/auto-news/2014/05/use-high-mileage-oil-car.html
Quote
Z. George Zhang, Ph.D. and director of Valvoline Technical International thinks so. He said there are "distinct differences" compared to regular oils.
"Most of the high mileage oil will have a seal conditioner," he said. "Normally they will have more seal conditioners in the formula." But that's not the only difference between them and conventional lubricants.
With elastomers, a fancy name for the rubber materials seals are made from, Zhang said over time certain chemical components can leach out of them. Special conditioning compounds "tend to react with elastomers," replacing what's been lost over time and increasing their sealing abilities. Think of these chemicals as a salve. If your hands are dried out and the skin is cracked you can rejuvenate it with lotion, which restores its flexibility.
"We researched a lot of these chemical compounds that can be used to rejuvenate seals" Zhang said. He also mentioned that seal conditioners help make seals more flexible and can cause them to expand slightly, another thing that helps stop leaks.
When is the time right to start running a high-mileage oil? The folks at Valvoline recommend you make the switch at 75,000 miles. Zhang said "we use 75,000 as a typical reminder," though you can certainly run MaxLife or a similar product beyond that, or even before.
Zhang said "it's really good for high-mileage engines… for when vehicle performance is deteriorating," but it can be used in brand-new cars as well. Added anti-wear and detergent compounds are just as helpful in a factory-fresh vehicle as they are in one that's got 75,000 miles on the clock.
https://www.autoguide.com/auto-news/2014/05/use-high-mileage-oil-car.html
