quote:
High TBN is important for rust prevention. We agree 100% on that. HD "dino" oils also have a high TBN. This independent of base oil type or brand.
Guys, I'm trying to figure out just how does tbn have anything to do with cling and long term storage against rust.
I think maybe there may be some confusion...
Total Base Number does not measure the accumulation of oxidation products or antioxidants, rather, it measures the depletion of a
detergents present in an engine oil for the purposes of neutralizing acidic blow-by gases which occurs due to low levels of antioxidants with in the oil. As the detergent is consumed in its role of neutralizing acids, the base number decreases from its original new oil value.
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Now, look at what a detergents function is..
additive type...
Detergents
purpose
Keep surfaces free of deposits
Typical Compounds
Metallo-organic compounds of sodium, calcium and magnesium phenolates, phosphonates and sulfonates
Functions
Chemical reaction with sludge and varnish precursors to neutralize them and keep them soluble .
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Ok, next,
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additive type
Dispersants,
purpose
Keeps insoluble contaminants dispersed in the lubricant.
Typical Compounds
Alkylsuccinimides, alkylsuccinic esters, and mannich reaction products
Functions
Contaminants are bonded by polar attraction to dispersant molecules, prevented from agglomerating and kept in suspension due to solubility of dispersant
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Now those play a role in TBN function.
I think what you're wanting or refering to is something that is a Corrosion and Rust Inhibitor. This has no direct relation to tbn.
additive type...
Corrosion and Rust Inhibitor
purpose
Prevents corrosion and rusting of metal parts in contact with the lubricant
Typical Compounds
Zinc dithiophosphates, metal phenolates, basic metal sulfonates, fatty acids and amines
Functions
Preferential adsorption of polar constituent on metal surface to provide protective film, or neutralize corrosive acids
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Yes, most diesel oils have this as a norm.