However, I have my own personal thoughts about engine oil. Having had a Honda Civic, Volvo etc. with 300K miles using standard dino oil, I have mixed feeling about synthetic and BMW LL01 oils.
If one has money to buy synthetic, by all means, use synthetic.
I am a "practical" kind of person and am also cost-conscious (I have a tight budget to operate the car) and go for the most bang-for-the bucks and since I live in cold climate:
- WINTER: 5W30 synthetic oil for easier cold start.
Whatever brand I can get for $3.99/qt. Menards hardware store here goes on sales quite often and I can buy synthetic for $3.99/qt.
- SUMMER: 10W30 dino oil for $2/qt.
I change my engine oil every 4-5K.
My daily trip is 12 miles/each way.
At 106K, my engine runs smooth like butter.
BMW "LL" is for marketing purpose of long-life oil change and does not sound very scientific at all. So I don't pay attention to LL01 spec. since I change my oil every 4-5K.