Hi-mileage oils

[66Sprinter]

I am curious about the new hi-mileage oils being touted on the market. My 200 is on the older non-rebuilt side, she does have some blow by and the plugs do get changed more often than supposed to. Yet she starts and runs great.

Has anyone ever experimented with the new hi-mileage oil? Does it really help the "small weepers" like mine? Is it worth the investment?

I have heard both pros and cons but thought this forum would be a better place to get the scoop.

 

[CobraSix]

Generally, this "high mileage" oils have additives similar to Mystery Marvel Oil which itself is basically a very thick oil that helps the seals and rings out.

Now, MMO works great. I would mess with other high mileage oil. You add like 1 bottle of MMO for 5 quarts of oil or something like that.

Slade

 

[simon]

Maybe the chem wizards of the leading oil corporations have found a way to stabilize the molecular structure of modern engine oils so it withstands higher heat ranges without being cracked down over a longer time than common (thus the term of "high mileage oil").

remember oil still gets saturated over time with acids that form during combustion.

The more short distance traffic and stop&go, the worse. Even if the oil has caustic agents to neutralize those acidic residues of combustion (I doubt it), there is a limitation to that ability as well.

Speaking for myself, I´d rely on the cheapest oil available and frequent changes.

 

[Anonymous]

The trick behind high milage oil as described to me by a penzoil represenative is that the oils are at the very high limit of viscosity for the given specification (much like a viscosity "tolerance") and have additional detergents and anti-wear additives. Some have a special additive to help stop oil leaks. Most are sythetic-blends, but none are marketed as such due to the very widespread and innacurate misconception that sythetic and semi-sythetic oils will somehow damage an older engine. The synthetic content helps prolong oil life and keep tighter control on the physical characteristics of the oil itself.

 

[Lazy JW]

The "High Mileage" oil that I have seen is advertised as being intended for use in older engines that have lots of miles on them, rather than being intended for longer intervals between changes. There are oils that are indeed intended to be used for longer intervals, they are usually some type of synthetic.
Joe

 

[LaGrasta]

"Speaking for myself, I´d rely on the cheapest oil available and frequent changes."

This has been my philosophy for years now. I buy whatever oil I can on sale, (59¢ or 69¢ a quart) and replace it every 3000 to 5000 miles and the filter every other.