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I used Mobil 1 15W-50. I have used numerous 5W-40 & 15W-40 oils since new and always had to add 1/2 quart or so in my 5000 mile change interval. Use increased a bit on 4000 RPM Highway days.

Now on my first run of 15W-50 M1 the level hasn’t dropped a bit in 2000 miles. I have used this oil in BMWs going back to a new 1972 R50/5…why did I ever stray?
 

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Mark – Moderator 2015 R1200R-LC Exclusive
2015 R1200R Exclusive
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Presumably the higher viscosity is such that less oil passes the oil scraper ring.
 
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