[saber9555]

2012 BMW 335is.
Oil change at 7400 miles.
No racing or driving in very dusty environments.
Changed the original Castrol factory oil.
Sent a sample to Blackstone Labs today and asked for the full test.
I should have the results in 4-6 days.
I will post the results.
I assume that these folks do a good job and can give us a good idea of how often I need to change MY oil. Remember, I live in Alabama so no Chicago cold starts or Arizona living in fiery hell driving.
For you pros; my 61 years of living make it difficult for me to be comfortable with extended changes knowing that my oil normal operating temp is 240F.
With the tight tolerances of turbos spinning at around 100,000 rpm I worry about my oil. Hopefully, I am the old guy with insufficient mechanic/engineer knowledge to have a clue what I am talking about.
All this said, the results may help some of us make a decision.
If it makes a difference, I lived in Germany for 15 years so I have a tendency to let let the lady run to 130-140 mph if the road is clear. This is for very short times as jail is not a good option.
By the way, I bought a 2001 325CI in Germany and drove it daily at 110-120 to work. At 130,000 miles it needs around one half liter of oil per 15,000 mile changes. Never had an oil change before 15,000 miles! Of note, this vehicle has no turbo.
Looking forward to your comments. Hopefully, my results will assist us all.
Schoenen Tag meine Damen und Herren.
Jim

[intoflatlines]

We've sent dozens of batches in to Blackstone over the years... great info and insight as to what's going on inside your engine!

[E39lolz]

I have a '13 x1 35i with the n55 and I changed the factory filled oil @ 1450 miles and again yesterday @ 5985 miles. Those metal deposits are not staying in my engine until the first recommended oil change @ 15k miles. OP, I read on Roundel that a BMW tech IIRC has a 335is and he changed the break in oil @ around 1500 miles and used TWS oil. Not trying to start an oil thread debate but his break in oil had some high metal deposits.