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Old 08-12-2014, 07:42 AM
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Oil change intervals

Have had my JGC Diesel since February and love it. One question, though.

Through three different versions of software (factory installed during a February build, one update, then another update) I've seen the oil life indicator perform very differently.

I only ran about 1,500 miles on the original oil and, computed out, the oil life indicator would have told me to change it somewhere just north of 5,000.

With that oil change they upgraded software and for the next 8,000 or so miles the mileage and the oil life remaining were in lockstep, projecting 10,000 mile oil life. It was pretty solid 1% drop per 100 miles.

Then at an oil change a couple weeks ago they again updated software and this time oil life remaining is back to declining at the original rate, about 2% per 100 miles, meaning something closer to a 5,000 oil change interval.

Driving conditions have been about the same, although I actually did more towing when the gauge was showing the longer oil life.

So, is the gauge accurate and what does it take into account? Am I right in assuming that the variable here is the software, and which version is closer to being accurate?

And, just a bit of paranoia. Is this thing so smart it would be acting differently if my dealer used the wrong oil -- not the fancy Euro L stuff we're supposed to run in these? I only ask because my confidence level in my dealership is ... well, lets say I'm trying to let them use my warranty period to overcome some negative opinions they've contributed mightily to in the past.

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Old 08-12-2014, 08:07 AM
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Re: Oil change intervals

This is why i change my oil every 5000 no matter what that gauge says. I know this is going to start an argument like in previous posts "That is complete overkill" but a $120 oil change on a $50K vehicle isn't a big deal. Once again it probably is overkill, and the oil still has life left when i change it, but it's certainly not going to hurt the engine. Unless you send a sample for analysis every time, which would also be costly, you'll never really know the true life remaining. So i choose to make sure it's always good oil in my engines. My 96 jeep is on this schedule and has 185K miles and runs perfectly. Also, with the diesel in the Rams i'm willing to bet the price of these filters will drop so it's easier on the wallet in the future. I do this on all my vehicles (3) partly because it's super easy to remember when each are due for a change.
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Old 08-12-2014, 09:29 AM
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Re: Oil change intervals

I've never waited for the full interval , but with the long recommended max and the higher price for this vehicle I was looking forward to stretching a bit.

That said, anyone with knowledge about how this gauge works, the effect of software and if this thing is smart enough to know and adjust for the wrong oil?


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Old 08-12-2014, 05:07 PM
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Re: Oil change intervals

Quote:
Originally Posted by Timo13 View Post
"That is complete overkill" but a $120 oil change on a $50K vehicle isn't a big deal. [...] Unless you send a sample for analysis every time, which would also be costly...
I'm having difficulty reconciling those two juxtaposed statements. A Blackstone UoA w/ TBN costs $35, meaning you could do that approximately 4x per cost of a single oil change, plus get trend analysis to monitor for incipient issues. Not that I care what you do, but sending off for a TBN @ 5k and deciding what to do based on the report would cost far less, given that you remarked about the cost.

I changed my oil at 4,175 miles and the sample analysis report indicated a TBN of 4.5. The data showed the oil had a lot of life left, and I felt reassured that I didn't have to guess about my safety margin.

I doubt I will let mine go the full indicated life, but as you pointed out, it's relatively inexpensive to do an oil change compared to the price of the vehicle. For the same reason, I believe it just makes sense to do a UoA each time, and I also do the oil changes myself to ensure that they are performed properly (following the proper 30–60 minute wait procedure, torque specs, etc).
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Old 08-12-2014, 05:20 PM
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Re: Oil change intervals

Quote:
Originally Posted by editordcf View Post
Is this thing so smart it would be acting differently if my dealer used the wrong oil -- not the fancy Euro L stuff we're supposed to run in these?
Uh, no. No, it's not. It's just a complicated software algorithm... and the revision they originally shipped was wrong.

Improper oil (i.e. anything that isn't low-ash [refer to the salient Chrysler specification]) will cause irrevocable pollution of the DPF. Basically, normal engine oil has metallic additives to improve performance. If those get into the DPF they can't be burned off (obviously). If this accumulates it will clog the DPF. Low-ash engine oils don't have those kinds of additives.

Send off a sample of your current oil to Blackstone Labs, and post your report in the Blackstone thread. If you have the Wrong Oil(tm) then the metals numbers will likely be increased.

What's $25 for a standard UoA in order to obtain peace of mind?
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Old 08-12-2014, 09:08 PM
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Re: Oil change intervals

If you changed your oil but didn't reset the meter could the car sense it ? Does it know if it has new oil in it or does it strictly go by countdown?

What if you just drain the oil and refilled it without changing the filter at 5000 miles and then had the dealer do it at 10000?


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Old 08-12-2014, 10:00 PM
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Quote:
Originally Posted by Stbentoak View Post
If you changed your oil but didn't reset the meter could the car sense it ?
No.

Quote:
What if you just drain the oil and refilled it without changing the filter at 5000 miles and then had the dealer do it at 10000?
Perhaps I'm missing something here, but I don't perceive your goal from this proposed course of action. From what others have said in different threads, the oil life remaining indicator should be reset with each oil change because it is a factor used in determining the DPF regen regimen.

I guess I'm of the perspective that if you really want to change the oil you should just do it correctly. If you are uncertain about whether to do the change early, then I suggest paying the $35 for oil analysis + TBN and using that as your decision criterion.

I can't perceive the benefit of putting in $85 worth of oil and not resetting the oil life gauge that affects the DPF regen. If I reset the oil life algorithm, I would want to change the filter too. Furthermore, I doubt the oil change would be ideal unless you remove the filter housing to allow the old oil to fully drain per the Chrysler-specified procedure. If you remove the housing you should replace the O-ring. The filter is "only" $40 more at this point on top of the $85 worth of oil, and at this level of disassembly it will take no appreciable additional time so why not do the entire oil change the right way and replace the filter too? I mean, that is if you are going to go through all of this regardless of whether the oil is spent or not.
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Old 08-12-2014, 10:13 PM
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Re: Oil change intervals

All I'm saying is that if you don't want to go the full 10,000 miles and you're not comfortable in changing it yourself ....anyone can just drain and refill it and renew 90% of the oil in a very few minutes.... then when the dealer does it at 10,000 miles appx,you have the peace of mind of knowing that your oil did not run the full 10,000 miles.
I've seen many owners manuals of vehicles and power equipment that advocate changing the filter every other oil change even though most people don't do it that way. And I can change it in 10 minutes without changing the filter and do it for about $65 or less with Amazon prime. To me it seems like much less work and expense , and sensible since the filter was designed to go 10,000 miles anyway....

But I certainly value everyone's opinion on here that's why I asked.....


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Old 08-12-2014, 10:19 PM
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Re: Oil change intervals

I always go full interval and never had any problems. Last time I used Blackstone to do UOA on my E-class it was low-SPAsh oil at 9700 miles on it and came back with 2.7 TBN considering that those oils start some where around 6.3 when brand new. Blackstone advice was to test it again after 3000 miles which is at the end of the mileage interval for change (MB indicator is set for one year or 13000 miles), thus why i just changed it instead of spending additional 30$ on UOA. Those new synthetic oils are much more temperature tolerant and they will last well past 10000 miles before sludge starts developing, thus I do not see the point of washing my engine internals very often.
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Old 08-12-2014, 10:25 PM
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Quote:
Originally Posted by Stbentoak View Post
All I'm saying is that if you don't want to go the full 10,000 miles and you're not comfortable in changing it yourself ....anyone can just drain and refill it and renew 90% of the oil in a very few minutes....
Ah. Well, I would then be concerned about putting in the correct amount of oil, given that the system isn't going to drain per spec via this ersatz procedure and the dipstick readings wouldn't be reliable during this metastable state.

Hm, perhaps you could estimate by mass if you had a precise scale.

To each their own, of course. I can see that I'm more of a binary person: I would give myself far more concern about a half-performed oil change procedure than any peace of mind I might get from adding new oil. This must be part of the reason that having the oil analyzed in a lab is appealing to me. I can quantify that.

Here's hoping we all find peace of mind.
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Old 08-12-2014, 10:27 PM
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Re: Oil change intervals

Can you tell me Timo13 what brand oil you are using when you say "you make sure it's always good oil in your engines"? Thanks.
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Old 08-12-2014, 10:54 PM
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Re: Oil change intervals

Quote:
Originally Posted by Roadkill View Post
This must be part of the reason that having the oil analyzed in a lab is appealing to me.
1+ on that, I just don't like the added cost. Maybe doing it every other year to keep eye on the engine wear will work.
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