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Old 07-05-2010, 08:44 PM   #1 (permalink)
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Default Oil change on Diesel engine and ECU service reset

I was considering doing my own oil changes between major services at the dealer to keep the engine oil in good condition as I have done previously on petrol engines.

However I have read some details that the ECU needs to have a counter reset whenever the oil is changed so that the programming for the DPF regens can run correctly.

Apparantly not doing this can cause problems in the DPF.

Does this mean nobody besides a Subaru dealer can effectively change the oil?

So I have a number of options.

1. Don't do the changes - leave it for the dealer. Not a real problem for now, but as the vehicle gets older I would like to do my own servicing.

2. Don't worry - do the oil change and dont reset the counter. If every second change is done at the dealer and they reset the counter does this really matter ?

3. Get an OBD II tool and reset the counter ? I'm not sure how to do this, some googling has not found any method for this vehicle - you can get tools for many European models. The Scangauge II seems to be able to send commands to the ECU but I'd have to know what commands to send... maybe in a couple of years the aftermarket tool providers will have developed a tool for this...

What do people think ? Has anyone changed the oil themselves on a this diesel engine, or used a non-subaru service centre ?
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Old 07-05-2010, 09:56 PM   #2 (permalink)
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Here's my reading on the subject. I've had some discussion with my dealer about it (pre-purchase) and have completed four changes myself.
The oilchange is super easy.

The ECU does indeed have a "dilution counter". DPFs using post-injection for their regeneration tend to leak a bit of vaporised fuel down through the rings, and this can dilute the lube oil. Things get even more tricky if you use biodiesel as it can polymerise in the crankcase. Not good.
The only way to reset the counter is using the SSM3 dealer tool. Maybe some of the top-end SnapOn or Bosch OBD tools can too, but they're just as pricey.
I had over 20k miles, and completed two changes, with no warning lights or issues. The dealer re-set the counter at that time (I was in for something else unrelated).
I'm led to believe that the counter is "turned off" in the UK cars to allow self-servicing and that resetting is an irrelevance. Dunno
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Old 07-05-2010, 11:17 PM   #3 (permalink)
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I've done one oil change so far, annual rather than at the 12000 mile interval. Keep all receipts for parts and/or labour, and be sure that the work is done by a "competent person" (in legalese speak) to meet the terms of the warranty.
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Old 07-06-2010, 12:44 AM   #4 (permalink)
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Reading the Australian Maintenance Schedule booklet. An item to be performed at each service is
Diesel - Reset the oil dilution ratio using the Select Monitor
OR information contained in the relevant workshop manual
This sounds like there is another way of doing this rather than using the Select Monitor tools. I know on VW TDI's you can do this using the key and combinations of the Odometer Trip meter reset button. So I suspect there is a similar sort of method for Subaru.

I suppose I need to get Subaru to tell me what this is. I know you can get the US service manuals on their techinfo site but these don't cover the diesel. I think this information should be available to owners without purchasing expensive service manuals. Changing oil should not be a difficult job.
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Old 07-06-2010, 01:03 AM   #5 (permalink)
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I've got the CD service manual. There is no customer method for oil reset. The CD is well worth buying, it was about 40 iirc.

edit: I query the legality of this oil reset myself. Might be why it's allegedly disabled in the UK cars...

Last edited by dpm; 07-06-2010 at 01:05 AM. Reason: additional info
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Old 07-21-2010, 12:50 AM   #6 (permalink)
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this worry me. i've just saw the requirement to reset ECU when i was reading the manual a few days ago.

if i choose to service car other then at a Subie dealer, its going to be an issue.

i like to change oil myself. if i know of this, i WOULD NOT BUY THIS CAR.

recall
just got a call from wife, there is a recall relating to the transmission.
any1 know anthing about??????
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Old 07-21-2010, 01:52 AM   #7 (permalink)
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Quote:
Originally Posted by smiley View Post
recall -- just got a call from wife, there is a recall relating to the transmission. any1 know anthing about??????
For the CVT, which fortunately is not fitted to the Diesel.

edit - I've just seen the other AUS post about the 6MT issues, but remember who was the first to have problems !.
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Old 07-21-2010, 01:59 AM   #8 (permalink)
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Quote:
Originally Posted by R5oss View Post
For the CVT, which fortunately is not fitted to the Diesel.
my car is a 2010 diesel with 6MT. i will find out more when get back home.
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Old 01-23-2011, 11:09 AM   #9 (permalink)
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Anything more been heard on whether we change oil ourselves? Was a previous poster correct in the idea that if you change half way to service and don't reset it's ok as they'll reset it once you do the 12500km interval service and the DPF didn't need to know about the in-between oil change anyway?

I just purchased a diesel and wasn't told much from the dealer in regards to DPF or counters or anything. I drive short 7.5km 60-90km/hr trips to work each day and I'm getting really nervous that the DPF is gonna crap itself now that I've read up on exactly how it works. What's the deal with injecting unburnt fuel into cylinders if it leaks through seals and into sump. Why don't they just inject it in the exhaust flow, wouldn't that solve any oil contamination problems?
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Old 01-23-2011, 11:41 AM   #10 (permalink)
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yes, but that takes another dedicated injection system...

I'm monitoring the km-to-oilchange figure in the ecu. It'll be interesting to see what happens to the ash % as a change approaches and passes.

The open-source tool I'm using for this will likely be updated to allow reset in future.
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Old 01-23-2011, 11:24 PM   #11 (permalink)
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Explain what you mean by the km-to-oilchange figure? Is there a figure counting down in the ecu? Also can you help explain why the ecu would care if you have an oil change? What does it do with the information of knowing an oil change has occurred?
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Old 01-24-2011, 12:09 AM   #12 (permalink)
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oil condition is determined by the amount of dilution calculated, non-combustible ash also factors in.
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Old 01-26-2011, 01:29 AM   #13 (permalink)
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Quote:
Originally Posted by dpm View Post
oil condition is determined by the amount of dilution calculated, non-combustible ash also factors in.
When you say oil dilution, do you mean dilution, because diesel is getting into the oil, from the regeneration occurences? Where does non combustible ash fit in, in regards to oil changes? Wouldnt that ash be in the DPF, not the oil?
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Old 01-26-2011, 06:24 AM   #14 (permalink)
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ash in the dpf, but from the oil. I can only surmise that old oil may burn easier, leaving ash in the dpf.
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Old 01-27-2011, 01:32 AM   #15 (permalink)
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How does oil get into the DPF?
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