How do these two differ? Afaik they're mainly used in detergents and dispersants. M1 seems to always be big on Ca.
Calcium vs. Magnesium
- Thread starter vinu_neuro
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afaik, Mg additive becomes an abrasive mineral as it oxydizes.
MolaKule
Staff member
Calcium is mainly a detergent and magnesium at one time was used in dispersants but its use has declined since magnesium leaves ash deposits.
Newer ashless dispersants are now used to disperse sludge molecules and soot.
Calcium compounds are "multifunctional" additives since they not only lift deposits, but also serves as a friction modifier and tbn booster.
Newer ashless dispersants are now used to disperse sludge molecules and soot.
Calcium compounds are "multifunctional" additives since they not only lift deposits, but also serves as a friction modifier and tbn booster.
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Considering that, what could be the reason Shell uses much more Mg in T6? Most oils I've seen (PCMO or HDEO) have much higher Ca.
RTS 5W-40 M1 TDT 5W-40
Moly---63ppm 0ppm
Boron--65ppm 78ppm
Cal----751ppm 1015ppm
Mag----1197ppm 746ppm
Phos---1078ppm 938ppm
Zinc---1262ppm 1118ppm
RTS 5W-40 M1 TDT 5W-40
Moly---63ppm 0ppm
Boron--65ppm 78ppm
Cal----751ppm 1015ppm
Mag----1197ppm 746ppm
Phos---1078ppm 938ppm
Zinc---1262ppm 1118ppm
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MolaKule
Staff member
Any oil formulation is a trade-off situation.
Magnesium dispersants are effective at dispersing soot so the soot paricles do not agglomerate, but this looks like an old school formulation.
In a situation as the above, the calcium and magnesium are in a combined detergent/dispersant additive package. If the volatility of the total formulation above is low, then there will not be much ash deposited.
The HDD additive package I use has high calcium and no magnesium whatsoever, but has a very effective non-ash or sshless dispersant.
Magnesium dispersants are effective at dispersing soot so the soot paricles do not agglomerate, but this looks like an old school formulation.
In a situation as the above, the calcium and magnesium are in a combined detergent/dispersant additive package. If the volatility of the total formulation above is low, then there will not be much ash deposited.
The HDD additive package I use has high calcium and no magnesium whatsoever, but has a very effective non-ash or sshless dispersant.
Originally Posted By: MolaKule
Newer ashless dispersants are now used to disperse sludge molecules and soot.
Any idea about what these "Newer ashless dispersants" show up as in the UOA results ?
Otherwise how to measure them / verify their remaining quantity ?
Newer ashless dispersants are now used to disperse sludge molecules and soot.
Any idea about what these "Newer ashless dispersants" show up as in the UOA results ?
Otherwise how to measure them / verify their remaining quantity ?
MolaKule
Staff member
Quote:
Any idea about what these "Newer ashless dispersants" show up as in the UOA results ?
Otherwise how to measure them / verify their remaining quantity ?
You can't detect them without specialized and expensive instrumention so they don't show up in VOA's or UOA's.
See post 530330 at:
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=530321#Post530321
Any idea about what these "Newer ashless dispersants" show up as in the UOA results ?
Otherwise how to measure them / verify their remaining quantity ?
You can't detect them without specialized and expensive instrumention so they don't show up in VOA's or UOA's.
See post 530330 at:
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=530321#Post530321
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