My buddy was told the same thing (by a Milwaukee 8 certified H-D tech) regarding his 2017 H-D Road Guide Ultra when it had some issues during our recent trip to Newfoundland. I have a real hard time wrapping my head around the idea of a bunch of engineers sitting around designing motors with "specs" like this. My old 2006 Yammie FZ-6 lost zero ounces of oil per 1,000 miles. My old 2007 Toyota Corolla loses zero ounces of oil per 1,000 miles. And if either of them lost this much oil, I would consider them broken and would take them in for service.
1l per 1,000 miles means your putting in half a litre every day when you are out touring, and that is considered "ok". Makes no sense at all. Losing that much oil means there is something wrong. It's bonkers!
Not being an automotive engineer, makes no sense to me to push excess oil out the air breather either, which my buddy was also told his brand new RGU would do. For one, it gums up the air filter*. For two, why not drip the excess into the cylinders and just burn it off?
*which, on the RGU at least, eventually creates vacuum pressure that continues to extract oil from the motor until the oil soaked filter is replaced, eventually bleeding your motor dry. Again, according to one Milwaukee 8 certified tech.
Not that the bikes use that much, only that bmw says that's what they consider normal. I've heard the GS's may use some until they get past 12-15K and nearly none after 20k on the bikes.
Like I mentioned, I used a liter in 4K miles to Ak. So I wasn't adding oil every 1K. On the GS, overfill the oil too much, it pushes the excess through the breather. To avoid that, don't overfill the oil, pretty simple right?
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