Originally Posted By: dnewton3
FCIs for the MG filter every 5k miles.
And you add 1.5 ltrs every FCI, right?
So how many miles represent a full OCI? IOW - how many liters used for the MG FCI will make for a sump exchange?
Presuming 15 qrts for the sump; you OCI about every 9th FCI (give or take a bit)
So 9 FCI x 5k miles is roughly one OCI every 45k miles.
Plus, you FCI the Amsoil FF filter every 25k miles? That's probably a qrt or more? (not sure which EaO you're using).
It's hard to make that FF cycle fit exactly into the MG BP regime, but we could say you're probably doing (roughly) a staggered OCI every 35-40k miles.
You're changing oil, just not all at once!
Also, why the mixed UoMs? (Miles for distance but liters for volume?)
I'm not lambasting the fun you're having. Nothing wrong with experimenting. Just need to keep a good tree-top view of things and realize the whole situation and not get mired (excited) about the details without understanding the top-level view.
Two BP systems plus OCIs every 40k miles will make for a really clean sump!
Thanks for the feedback. Yes you are correct, it's basically an oil change every 35,000-40,000 miles. This however is a huge leap for me who changed oil every 10,000 miles before adding a bypass and using oil analysis to determine when to change the oil. The MotorGuard is a new addition to the Puradyn MTS-24 in the last 5000 miles. The reason I installed the MG, was to keep the TBN up on the oil and reduce the replacement of the Puradyn MTS-24 filters. As this is my sisters truck, I only see it 4 times a year to service it and that's where I get the 5000 miles from. It only takes me 5 minutes to swap out the MG filter and add 1.5 ltrs of oil to the truck. I then do a grease job on it and an overall inspection and away it goes for another 3 months, for me that's a win win.
The Amsoil Full flow I'm using is the EA080 which is about a ltr of oil and Amsoil recommends a change every 25000 miles. As this is the first Amsoil full flow filter I've used I'm changing it out and cut open to inspect. I'll be replacing it with another EA080 unit and if the results are good on the first filter I'll extend the service to 35000 miles as having the bypass system I'll be able to extend change intervals. I'm taking baby steps on this unit as I'm new to extending oil drain intervals. If after several more oil tests I find that everything is still ok, then I might start changing the MG filter every 10,000 miles or until the unit is getting cold. As the Cummins is such a great engine I can't see why it would not go to 10,000 miles on a MG filter, but we will see.
As far as the Units are concerned I do apologize, I grew up using imperial measurements, then they changed to metric the last few years of school. To make matters worse I flew for 30 years as an airline pilot in Canada, Middle East and the last 18 years in Hong Kong. I'm just used to using distance in miles and fuel,oil in KG and ltrs.