Quote:
Originally Posted by Veilside
Hello all,
I would like to add some useful information into this thread since I also own a 2011 N55 335i with currently about 86 000 miles. My production date was 02/10 Munich, Germany. All stock. So far I have done two Blackstone Oil analysis.
The first oil analysis was done at 81 000 miles and came out pretty bad as the iron level was a little too high. It may be the cause long oil interval at around 7500 miles with the original 5w-30 BMW Oil, and also it was during winter times hence maybe the freezing cold start may have cause some harm here in Canada.
The second one was done at about 86 000 miles however was very good as all the metals were lower than average and the oil was changed at about 5000 miles. I was also using Liqui-moly 5w-40 during that time.
Maintenance done so far were:
- OFHG @ 81 000 miles
- Serpentine belt @ 81 000 miles
- Coolant expansion tank @ 81 000 miles
- Spark plugs @ 60 000 miles
- water pump @ 65 000 miles
Recall for VANOS bolt were done in 2014, and I am currently the 2nd owner. Car were always warmed up with the oil temp to 2 notches on the gauge before beating on it. Have been using 91 shell ever since I owned the car.
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Question for you sir. Looks like for both oil changes you did not have to add any oil during the oil change interval of 9k miles. I know these motors burn oil. Some more than others. But to add nothing seems pretty extreme. For me i usually have to add half litre for 5000 km. So at 15 k km i would have added a liter and a half. (This amount depends on how hard i drive it too). So when u changed ur oil how much oil came out ? Do you ever measure that ?