Is “high mileage” oil just a scam?

Not necessarily, most of the time it means a more robust additive package.

If you want your truck to run better longer, get 100% synthetic. I’m not talking about “full synthetics” like royal purple, mobile, t6… etc those are only semi synthetic.

I’ve ran them all in different applications, hotshots secret makes the best by far, followed by amsoil.

Been running valvoline high mileage in my suburban since the 106k mile mark... At 285k now

Not necessarily..

I started it on my 2013 Suburban at 175k. Trusted mechanic suggested it

I don't trust the additives in the high mileage oils. Like someone said, they are supposed to help the rubber gaskets and maintain seals or some shite. It probably does help in the beginning, but in my opinion, based on other people's opinions, the additives may not be good for the rubber in the long run. I put that shite in my old truck, but based on what I read, I wish I didn't do it. I would just buy full synthetic if I had the same choice today.

Don't recommend it, especially at only 100k miles and no issues.

As others have said, read up on bobistheoilguy if you want to nerd out on what the best oil for a given application is.

As someone said in their reply below high mileage oils have seal conditioner additives.

However... purely for the engine and moving components an oil that contains molybdenum is excellent for high mileage vehicles. Molybdenum is commonly referred to as Moly.

I’d stay away from the high mileage blends unless you are experiencing valve stem seal leaks or other problems you are hoping to rectify with the special additive package.

I do 5k oci and I have been happy with Kirkland synthetic from Costco. It gets good marks on bobistheoilguy and is made by Warren who packages many leading store brands.

I’ve never been a believer in the long oci’s. I’m not saying it can’t be done but you hear lots of horror stories with long oci’s and modern engines.

I just don’t think it’s worth the risk and the additional cost of a 5k oci with a brand like Kirkland isn’t much.

You are questioning about certain brands of oil that claim to be “ high mileage” as in better for cars and engines with additional miles. A scam can be viewed as any this included as such

I have been treating my oil as high mileage since the 90s with zero issues.