What is High Mileage Oil? Do I need it? Why does it exist?
So, here's the deal! High Mileage Oil is advertised for engines over 75,000 miles, but is 75,000 miles high mileage? Most engines, if taken care of, can get 200,000 to 300,000 miles on an engine. In my opinion, a car wouldn't be considered high mileage until at least 150,000.
High Mileage Oil is an additive in the oil. Over time, the wear and tear on your engine will shrink and dry up your seals and gaskets, therefore, possibly creating oil leaks in your engine. The additive in high mileage oil is tasked to revitalize the seals and gaskets in your engine. This helps with cleaning all the gunk out of your engine, it will swell your seals and gaskets back to its original size, to help ensure leaks don't occur. Is this a good idea?
I don't recommend High Mileage Oil until you start noticing an oil leak. Once you start using high mileage oil, I would suggest continuing to use it, or the leaks my reoccur. Stopping leaks by using high mileage oil, is not guaranteed. Take it for what you will, this is my opinion, and we'll talk to ya next time!