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S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
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Oil Service RequiredViews : 3235 Replies : 21Users Viewing This Thread : |
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Dec 14th, 2019, 15:57 | #11 | |
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Dec 14th, 2019, 17:10 | #12 |
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Sorry my writing style! Dumped or not, it does end up in the sump. So the two things I take from your post are that the diesel dilution is less harmful than petrol and that they haven't stopped it from happening but have reclassified the 100% oil fill level and the overfill warning level. I can live with that if I can be assured that even the less damaging diesel fuel contamination will not reduce the operating parameters of the oil. My software is routinely updated and is fully up to date.
What worried me was that the oil manufacturers hardly designed the oil to have to carry an addition of 33% of the original oil volume of diesel fuel and that the spec of the oil must reduce because of this. If I can be assured that the oil can handle this abuse then I can stop worrying about it. Of course I assume that the amount of petrol finding its way in the lubricating oil in a petrol engine is far less than the amount of diesel from failed regeneration cycles but maybe the oil can deal with lesser amounts of petrol in the same way that it may be able to deal with larger amounts of diesel. Neither Volvo or the oil manufacturers would seem likely to want to publicly pronounce on this aspect of engine lubrication.
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2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey |
Dec 14th, 2019, 17:44 | #13 |
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Assuming the sump capacity is around 5.7 litres and the difference between the max and min marks on the dipstick is in the normal region of about 1 litre, reducing the maximum oil fill level by a quarter of the dipstick scale allows for a maximum dilution level of a tad over 4 per cent of oil volume by diesel and other by products of non-spontaneous regenerations. I can't see where you are getting a sump 33 per cent full of diesel from? To get to that level you would have to somehow lose over 2 litres of oil and replace it with fuel!
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Dec 14th, 2019, 17:47 | #14 |
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I don't worry about it, the oil is designed for 18,000 mile changes and my car does 6000 a year, so my oil is only a third used when changed.
If oil contamination is a worry I would just do an interim oil change at 9000 miles on a big miles a year car. I change the landrovers oil twice a year and that does prehaps 8000 a year, it does however get driven through ford's and water troughs where water contamination is a possibility. Hot engine, cold water and it's possible for water to be sucked in past the oil seals which are designed to keep oil in not water out. Paul. |
Dec 14th, 2019, 18:03 | #15 |
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Dilution of the engine oil by small quantities of fuel is a feature of most if not all diesel engines with DPF technology. Modern emission control technology compatible oil is designed to cope with a certain amount of fuel contamination. Many vehicles have software algorithms in their ECUs that calculate the likely condition of the oil based on the number and type of regenerations occurring, and notify the driver if an earlier than scheduled oil change is required. If the oil change schedule is 12 monthly I personally wouldn't be worrying about it. Most software interventions seem to occur on vehicles with 24 month or longer scheduled oil changes.
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Dec 14th, 2019, 19:35 | #16 | |
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Dec 17th, 2019, 08:34 | #17 |
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No oil rising as far as I know. My interest is that even if the oil level remains constant, if there is fuel dumping in the sump balanced by oil usage, the quality of the oil will not be as originally specified and that might increase engine wear. So my question was whether the software modifications put in by Volvo in response to the oil dilution problem eliminated the dumping of fuel during abortive regeneration or whether they merely made room for oil level rises by reconfiguring the oil level limits. My 2012 XC70 is a keeper and probably the last car I'll own, so I just am interested in whether there is any problem below the radar which could shorten the engine life. Also understanding my car better helps with peace of mind.
My reference to 33% dilution was based upon the oil fill being reduced to 75% allowing 25% room for fuel dumping. 25% is a third of 75%. I'm not saying that my car actually has that degree of oil contamination, merely asking whether Volvo have actually allowed this large margin of contamination before the oil level sensor issues any warning. If the software upgrades have reduced the degree of contamination, why leave such a large margin to cope with it? This is just me being curious about the way Volvo design and develop engine modifications as I found it hard to believe that they could have put an engine out with that degree of tolerance on what is an unwanted side effect of DPF regeneration. Discussion rather than complaint.
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2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey Last edited by Tatsfield; Dec 17th, 2019 at 08:43. |
Dec 17th, 2019, 10:30 | #18 | |
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I can't comment on whether or at what point Volvo consider the level of contamination to be excessive, but small quantities of fuel entering the sump during certain types of regeneration cycles is a feature of almost all modern diesel engines with emission control technology. I also have a Ducato van. Dealers normally refill the oil to 0.4 litres below maximum to allow for a margin of dilution in use. On that vehicle, there is a software algorithm in the ECU which assumes a certain amount of contamination according to driving conditions, type of usage and the number and type of DPF regenerations. The counter alerts the driver if it considers that the oil needs to be changed prior to a scheduled service. Scheduled oil changes are at 24 months intervals on that vehicle. I change mine annually, but that's another story. |
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Dec 18th, 2019, 08:41 | #19 |
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Just a quick follow-up. 5 minutes on google and I found that up to 5% oil contamination with fuel seems to be the accepted norm across the motor industry in general, and that laboratory tests on modern diesel oils in Germany found that those oils remain within specification up to around 13.5% dilution.
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Dec 18th, 2019, 08:54 | #20 | |
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