Originally Posted by GillyWI
"It's all good". I'd change it over at your next regular service, not before.
What Gilly said.
Use a good quality synthetic oil and change it at the recommended intervals. Then just keep on riding.
But if you want to be a bit more specific for your new baby, then here goes.
The current BMW spec for engine oil is:
4L Motor Oil Power 1 Racing 4T 5W-40 BMW Part# 83 12 2 153 837
I don't have a current price from BMW, but I have gotten similar oil from Cycle Gear. Look for:
4L Repsol Moto Racing 4T 100% Synth SAE 10W-50 $56.99 (4 liter jug)
This meets BMW's JASO spec. Note that BMW used to recommend the 10W-50, but now recommends 5W-40. It looks like the Repsol 4T is also available in a 5W-40 weight.
I've also used Mobil1, Castrol, and whatever synthetic I could find at WalMart while on a long road trip. Changing the oil in a random parking lot isn't fun, but can be done.
And I've gone 12K between changes as well, when I just couldn't be bothered to change it out on the road. With 115K on the bike now, I've never had an oil-related problem (well, except maybe for that random clutch squawk that the Slant/4 engines are famous for.
'13 Dark Graphite Metallic K16GTLD, 24K miles and counting...
'09 Magnesium Beige Metallic K13GT, 60K miles miles and counting...
'02 Mauve Metallic K12LTC, 106K miles and sold
BMWLT#145, IBA# 366, MOA# 111996, SCMA# 24032
All lower 48 states plus Alaska on the K13GT in two weeks . . .
Some people see the gas tank as half empty. Some see it as half full. All I care is that I know where the next tankful is coming from...