Engine oil VALVOLINE or OEM BMW

10w60 is the only oil you should put in these. If nothing else, you can usually find it at BMW automobile dealerships as that is what they put in the M3/4 series (or at least used to). Not cheap, but a lot less expensive than engine rebuilds.

Valvoline Restore & Protect is reportedly great.

I run Valvoline restore & protect because 2x 5 qt jugs fits my 4 qt Prius and 6 qt Maverick perfectly and I run it on the Prius which has stopped oil burning from the low tension rings.

Both of my Guzzis ran better on Valvoline. This is if you’re in USA

I'm using Valvoline 0W-20 Restore and Protect, changing every 4,000 miles. '23 OBW, 56,000 miles. FYI, I did an oil analysis at my last oil change. Wear numbers were excellent, less than 1.5 ppm/1,000 miles. 3 iron, 2 aluminum, 1 copper over 4,128 miles. Fuel dilution was HIGH though, at 4.3%. They expect 1.5- 1.8% for direct injection turbos. According to the Motor Oil Geek, less than 5ppm/1,000 miles is considered good. I do a fair number of short trips, but also some longer runs. I'm going to go to max of 4,000 miles due to the gas dilution.

I’ve used it, no complaints.

One oil that seems to work from all the videos I've watched for cleaning varnish is the Valvoline Restore and Protect.

I use this on my Hyundai Elantra for the past 100k miles ... It's already at 200k and the engine still feels new ... I use Valvoline for everything including power steering ... Valvoline syn blend is a great oil option ...

I went to Valvoline once, oil pan emptied itself onto their floors the moment I started the engine. Joking aside I think it's perfectly fine to go to Valvoline, I go there often bringing my own oil and filter, that way I know it's the right oil and it's good quality stuff.

Oil leak. Thats my G20, had to fill like 3 times oil myself during 30 000 km. Went to service and apparently they found two separate oil leaks