When lubing my engines I worry most about bore polishing . I like to keep the iron down to but here's my question .

There is an additive that says it nearly eliminates bore polishing when added to oils . I think they speak primarily of dino's but thats not the point .

What could be in a additive like this that has no real TBN to speak of . More of a better dispersant ? Ester used as a surfactant ? Both ?

Does it prevent bore polishing? Or does it claim to restore polished liners?
I always recommnend not to add any additvies in ready formulated oils - you never know what will happen.
If you care about bore polishing, avoid oils with high magnesia levels - magnesia is known to promote bore polishing.

Callisa,

How do you which oils use magnesia?

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Callisa,

How do you which oils use magnesia?

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Good point, from some oils, I just know...

I think there's a difference between Magnesium Carboxylates and the newer Overbased Magnesium Sulphonates when it comes to build up under the ring pack in diesel engines .
It's the hard particle build up doing the abrasive damage while being swiped up and down the cylinder by the piston ring , not the magnesium in solution .

Moisture in the crankcase is a major cause of this from what I read .

MG ,
New oil analysis is one way to tell which oils use magnesium obviously but these metals are proprietory and the types of cannot be distinguished . Labs can have trouble reading levels of certain calciums vs magnesium even .

The days of oils using lots of magnesium may be numbered but many companies still use it in their oil formulas for both gas and diesel engines . The 506 oils will have it at around 300ppm , Amsoil uses it at around 500-600ppm .

Mobil Trysyn used it at almost 1000ppm . I no fear magnesium

Many are trending towards Overbased Calcium but I read that high Zinc competes with it for a place on the metal .

Nothings going to be easy for the chemists of 2010

Sulfur is another component the makers are taking out of formulated oils . One step towards this is using higher refined base oils and I read that the days of Sulfurized MoDTC is numbered because of it .

Moly on the way out , esters and components of are paving their way in

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I think there's a difference between Magnesium Carboxylates and the newer Overbased Magnesium Sulphonates when it comes to build up under the ring pack in diesel engines .

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The build up under the ring pack ("ring riding") is somewhat magic and nobody really understands how it works. Even slight changes in your piston ring design or rather minor production deviations suddenly have a big influence.
A little oil consumption is rather helpful to prevent such build ups.

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Sulfur is another component the makers are taking out of formulated oils .

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Just for the sake of exhaust devices and new exhaust limits like Euro V...

I beleive the best way to deal with pollution for now is to build better catalytic systems and use more efficient combustion chambers while upping the Noack of the oils used and leave the phos cap of .008% alone .

Or , the auto/truck makers could be made to give new a free car system at say 150k miles for example but going to a light wt oil with 500ppm phos that an engine will burn more of over the engines life might just pollute as much as a bit thicker oil with great Noack and 1000ppm phos .

The carboxylates are organic compounds of a carbonyl group attached to a hydroxyl group.
Many long-chain carboxylic acids occur naturally as esters in fats and oils; the glyceride molecule is one of them.

Adding an additive that goes after one part of the protection changes the balance of the additive package. It competes for the surface area and reduces the ability of the other addives to work. So it may have additional zinc or something, that may in fact reduce some wear, at the expense of sludge and poor cooling. (or any other unkown reaction). Ane the reaction can be different with different base oils. The SAE papers written on the results of the CH-4 and CI-4 studies are interesting reading on different effects of each additive system on the different base oils.