M5 High Oil Use

Discussion in 'M Power' started by Lucero, Sep 20, 2016.

  1. Lucero
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    Lucero

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    Think I've put 5 litres in since taking ownership in April. Oddly though, and given some harsh runs since, it doesn't seem to be telling me as much.

    I understand that high oil consumption on the F10 M5 can be attributed to how the car was cared for in the first few miles of it's life.

    I'll mention it at the next service, but for now it seems OK. Has anyone else had similar?
     
  2. RichardP
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    RichardP

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    I've heard of cars that have used a lot and it does appear that they are very sensitive to how they are run in. My M6 uses nothing in 10,000 miles.

    How many miles have you done since April? I believe the allowable consumption is pretty high, maybe 1 litre per 1,000km, so if you've done more than 3,000 miles or so, it's probably within spec.
     
  3. Spuffington
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    Spuffington Moderator WARLORD Site Supporter

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    As above, you don't say how many miles you've done since April. The permissible tolerances for most engines are quite high in terms of oil consumption but I believe, as @RichardP has indicated, for M cars it's even expected to be higher and particularly so in the early life of an engine.

    If you're particularly concerned, I'd call the dealer first as they will be able to tell you the tolerances.

    But you do need to put it in context first. 5l of oil is nothing if you've done 5k miles. But it is if you've only done 1k miles. :whistle:
     
  4. Lucero
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    Lucero

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    I think the car was on 19200 when I bought it and now on 23500 or so
     
  5. Spuffington
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    Spuffington Moderator WARLORD Site Supporter

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    Sounds like you're most likely in range. But if you're concerned, drop your dealer a line.
     
  6. RichardP
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    RichardP

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    Found this from an October 2015 Technical Service Builtin

    Oil Consumption specification:
    - All BMW engines (excluding Motorsport) can consume up to 1 quart of engine oil per 750 miles at any time.
    - Due to the increased engine power, all Motorsport engines can consume up to 2.5 quarts of engine oil per 1,000 miles at any time.

    So even 5L in 4,000 miles is well within spec - could be 10L in 4,000 miles!! Still worth mentioning though, pretty much the only cure is a new engine.
     
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  7. Singvogel
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    Singvogel Moderator WARLORD Site Supporter

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    It's well nigh impossible to get a dealership or the BMW tech division to define exactly what is high oil consumption.

    It's always been like this - back in the day the first production line M car (the E28 M5) with the M88/1 engine was famous for it's thirst for oil.

    Even my E28 528i of the same era with M30 engine used a litre or so every 2000km when pushed hard

    My complaint wasn't about the amount of oil it used - it was the constant hassle of cleaning the rear valance and back bumper which always had an oil haze on it.
     
  8. The Livster
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    The Livster

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    Mine has used about 2 litres in 7 and a bit K
     
  9. K777
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    K777 WARLORD Site Supporter

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    i remember having a stand up argument about oil a couple of weeks after a service, and the oil light came on. assuming i had been charged and they hadn't filled.
    i was amazed that engines use so much oil these days, so much for advancement in technology and tolerances etc.
    anyway after picking myself up at the cost, i bought 5 liters on the web for the price of one.

    i have a similar frustration with the back of my car, presumably when going from electric to engine at high speed and into instant high revs it splurts out some shit. it must be this as it can be there even after a short journey after being washed. people think i nuts always cleaning the back end.
     
    Last edited: Sep 21, 2016
  10. RichardP
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    RichardP

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    As has been mentioned, the reason that some modern engines use oil is because they are not run in correctly. This is partially the manufacturers fault for not telling people what to do and partly the misconception that an engine must be babied when it's new. If you follow the manufacturers guidelines to the letter and viewing them from a certain perspective then you will probably have an engine that uses no oil. If you use very few revs and low load then you will probably have an engine that uses loads of oil.

    The critical time for the engine is the first 50-100 miles, just one or two hours. After that time the way you drive the car will have little effect on oil consumption. It's critical in those first hours to rev the engine to the maximum specified for the running in period, but with relatively light load and with as much engine breaking as possible, lower gear than normal and varying your speed without braking. After the first couple of hours, then use less revs and gradually increase the load.

    The reason is that the piston rings must seat correctly in the cylinder bores before they get coated with varnish from combustion. If they don't get seated fully then you'll get oil blow by which will increase oil consumption and reduce the engines power, the use of very thin oils does not help, but it's not the real cause. The varnish that gets deposited is intentional and improves the longevity of the engine. After the varnish is created, the next aim is to wear in the journals and other bearings. You'll often find that ex demonstrator cars will have low oil consumption because they have been revved quite hard when new, but they may also have other wear issues because they have continued to be revved quite hard!

    I've used this method on several new engines and never had any oil consumption issues - I don't think I've ever had to top up an engine that I've 'run in' between oil changes, with the exception of a 0.25L top up to my M6 shortly after the first service and I think that was because they did not put quite enough oil in! As I said, my M6 uses nothing at all between changes every 9-10,000 miles and many people have reported significant oil consumption issues with the S63TB engine.
     
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  11. Singvogel
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    Singvogel Moderator WARLORD Site Supporter

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    Not an M Car I know but I ran-in my 330d exactly as @RichardP describes.

    I haven't needed to top-up at all in 10K miles. :)

    As an aside I hope that everyone is aware that if you have a 'Service Inclusive' deal then all top-ups of oil are included.

    They only put in whole litres though - as I found out when i asked them to put a half-litre in my 320d a couple of years ago.
     
  12. stevie53
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    stevie53

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    I've done over 23K in my F10 M5 since November 2016 and topped up 4 times myself, dealer also topped it up once and it's had 1 oil service in this period.

    My other M cars
    E34 M5 1L every 6 - 700 miles
    E39 M5 1L every 1500 - 2000 miles
    E34 M5 1L every 1 - 1200 miles
    E92 M3 1L every 2000 miles
    E90 M3 1L every 2 - 3000 miles
     
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  13. zarnd
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    zarnd

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    My e39 M5 didn't use a drop of oil when I had it. I did 20,000 miles in it over 6.25 years.

    My e61 M5 I have had to top up once so far in the 700 miles I have had it, but it was low when I picked it up though.

    cheers
     

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