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Thanks everyone for your replies. Based on the discussion I'd say the Acteva 10w40 I've ran for the past 6k miles over two changes was totally fine, but not technically the best option if I end up out on a real hot day. I did end up switching over to M1 15W-50 and will run that from here out...

this year BMW is a dry clutch, has separate gear oil.

The gauge has bars and no numerical value, usually running right in the middle (4-5 bars) and I've seen 6 bars once or twice in traffic for short times. From what I can find on line that's something around 200-250F... but again, not entirely sure. Edit, These are the temps associated with...

Thank you thastinger, I may try the M1 next oil change. Why do they rate the 15W40 & 20W40 so much higher on the temp rating when they are all 40W?

Hi, I've been a long time reader on the site... first post. I have a 2009 BMW R1200GS (oil cooled, 42K miles) and have been running Castrol Power1 4t synthetic10w40 in it for the last 4k miles. I'm in Maine. I ran Actevo 10w40 semi synthetic in it for about 4K miles prior. My question is...