Quaker State® Ultimate Durability™ is our most powerful formulation, providing extreme engine performance and protection against deposits, which allows your engine to operate at maximum horsepower.

In fact, given Quaker State's results, no leading motor oil can outperform Quaker State Ultimate Durability full synthetic motor oil on the Sequence IVA – not Castrol, not Valvoline, not Mobil 1."

Quaker State has a complete line of top-quality oils and lubricants to keep your vehicle and its systems running longer. Back up the clock about 20 years and I used Quaker State on just about everything with never a problem. There's nothing wrong with QS motor oil.

Nothing's more important to your vehicle than durability. And that's what you get in every Quaker State® motor oil. We offer up to 300,000 miles or 10 years (whichever is first) if you exclusively use Quaker State® motor oil products.

Quaker State has always been considered a cheap oil. It was mainly because they lacked the proper additives to make them a top tier oil. I still don't use Quaker State because of their reputation which, for me, dates back to the 1960's. I have never had a problem with Castrol and I see no reason to change.

In general, though, modern cars can manage 5,000 to 7,500 miles between oil changes. If your vehicle calls for a blended or full synthetic oil, you can push that to 10,000 miles.

Synthetic Oil Change Interval Most synthetic oils are rated to last between 10,000 to 15,000 miles, or six months to a year. Manufacturer recommended ratings are typically applied to "normal driving," and don't reflect severe driving conditions that may require more frequent oil changes.

In fact, given Quaker State's results, no leading motor oil can outperform Quaker State Ultimate Durability full synthetic motor oil on the Sequence IVA – not Castrol, not Valvoline, not Mobil 1."

Engines with newer technology often use synthetic oil and can travel 5,000, 7,500, and even 10,000 miles between oil changes. While more exacting standards in engine-building tech are now in play, the quality of synthetic oils has also improved. Your owner's manual has the manufacturer's suggested oil change schedule.

Oil companies and automakers would like you to change your oil at 15,000 or 20,000 miles, especially with high-quality synthetic oils. Still, there are real dangers in adopting such long oil change intervals, especially if your car wasn't made for it.

Most synthetic oils are rated to last between 10,000 to 15,000 miles, or six months to a year. Manufacturer recommended ratings are typically applied to "normal driving," and don't reflect severe driving conditions that may require more frequent oil changes.

AMSOIL synthetic motor oil uses naturally shear-resistant base oils combined with top-tier, shear-stable viscosity improvers that withstand extreme heat and shearing forces. Not only does AMSOIL exceed industry standards and outperform competing brands, it fights viscosity breakdown 46% better than Mobil 1.