High mileage motor oil

[StuP]

I've heard MMO recommended in several places.

 

[Jeddak]

It was developed in WW2 to clean up the severely leaded aircraft engines. In modern engines it makes a good upper cylinder lubricant and cleaner, as well as a fuel pump lube.

 

[Greybeard]

Never ran high mileage oils in my vehicles. I use Walmart oil in them all. Been doing that for quite awhile, I retire them when they hit between 400k-500k. Worst I had was one using a qt of oil every 5k miles, but it was oil change time anyway.
I think (perhaps I am wrong) the key is to change it on a regular intervals.
I do run rotella t in my tractor, was told it has a higher sulfur content for diesels.

 

[Jeddak]

it is not just sulfur. Diesel-rated oils have more cleaners and acid reducers (higher TBN, total base number) due to the nature of diesel fuel.

 

[baxterday]

I have a 1996 K1500 Suburban with 270k on it, I run Mobil 1 15w-50 in it and change it about every 5k. It burns a little oil between changes. I regularly change tranny fluids and rear end oils as well.

 

[woodstock]

Nope don't use the high mileage oils. Use full synthetic and a long life filter. Change every 7500.

 

[StuP]

I run synthetic in the wife's car as it's a turbo and change every 5k.