Hi,
heyjay - as you are aware most times the "crud is like cement". We clean our centriguge units now at every second OCI ( 125k miles)
Msparks - the links are excellent but your comment;
"Oxidation, Nitration and TBN loss are some limiting factors to extending drains with this system"
should more accurately read;
Oxidation#, Nitration# and TBN# loss are some limiting factors to extending drains!
As to moisture#, fuel#, glycol# and other non particulate contaminants#, well I know of no viable system for automotive use that will satisfactorily remove these things short of an OC.
And of course to repair the relevant problem(s)
I have tried cleanable SS 30micron FF filters in conjunction with the centrifuge too. They worked well but at $A900 were not cost effective here. Our best method has been to use Donaldon's ELF FF filters that stay in place for a complete OCI of 62k miles.
On opening these at the OC point they have always been very clean and could have been used again
With a centrifuge installed the FF filters become virtually useless except to trap major contaminants - and are hopefully never required
We have never prematurely trashed significant oil (in the many millions of miles of using Del 1 and the centrifuges ) during an OC cycle due to the things above marked#
As mentioned elsewhere on here the engine manufacturer's wear metal, soot and TBN limits along with the Oil Company's TBN/TAN/Viscosity criteria are the major limits.
Plus of course we use our own experience,knowledge and intuition and UOAs using trend analysis of course!
I do know that I would never purchase a new commercial vehicle without a centrifuge installed ( some Euro makers fit them as standard )
I know too that I could easily go beyond 62k miles OCI on my current installation ( Del 1 + ELF filters + centrifuge ) but it is my commercial decision not too. It is not a technical decision and never has been
Perhaps I have been lucky!
Regards
[ January 21, 2004, 01:50 PM: Message edited by: Doug Hillary ]
heyjay - as you are aware most times the "crud is like cement". We clean our centriguge units now at every second OCI ( 125k miles)
Msparks - the links are excellent but your comment;
"Oxidation, Nitration and TBN loss are some limiting factors to extending drains with this system"
should more accurately read;
Oxidation#, Nitration# and TBN# loss are some limiting factors to extending drains!
As to moisture#, fuel#, glycol# and other non particulate contaminants#, well I know of no viable system for automotive use that will satisfactorily remove these things short of an OC.
And of course to repair the relevant problem(s)
I have tried cleanable SS 30micron FF filters in conjunction with the centrifuge too. They worked well but at $A900 were not cost effective here. Our best method has been to use Donaldon's ELF FF filters that stay in place for a complete OCI of 62k miles.
On opening these at the OC point they have always been very clean and could have been used again
With a centrifuge installed the FF filters become virtually useless except to trap major contaminants - and are hopefully never required
We have never prematurely trashed significant oil (in the many millions of miles of using Del 1 and the centrifuges ) during an OC cycle due to the things above marked#
As mentioned elsewhere on here the engine manufacturer's wear metal, soot and TBN limits along with the Oil Company's TBN/TAN/Viscosity criteria are the major limits.
Plus of course we use our own experience,knowledge and intuition and UOAs using trend analysis of course!
I do know that I would never purchase a new commercial vehicle without a centrifuge installed ( some Euro makers fit them as standard )
I know too that I could easily go beyond 62k miles OCI on my current installation ( Del 1 + ELF filters + centrifuge ) but it is my commercial decision not too. It is not a technical decision and never has been
Perhaps I have been lucky!
Regards
[ January 21, 2004, 01:50 PM: Message edited by: Doug Hillary ]