Deleted account 191119001
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i use 15/50 300v never had a problem.. and never uses oil
Think snelly has a valid point, everything new needs to be broken in and the thinner oil allows this, hence sometimes the odd metal shavings found on magnetic drain plugs, but I imagine once everything is worn in nicely, you could move oil up a little, obviously depending where you live and ride, but even if you live in a hot climate the temp inside the engine will be at least 5 or 6 times hotter, the below reading is not from me, but gives me a personal understanding of our LC engines.
I think much of this has to do with the hardware. Watercooled and many oil-cooled engines should have a functioning cooling system (radiators, thermostats etc) which tries to keep the engine in it's operating range.
If it's 5C or 50C ambient temp, the cooling system should maintain the operating temp at about 95C or so. The operating temp oil viscosity is determined by the engineers to maintain adequate oil pressure and bearing film thickness. It also has something to do with how fast the oil can be recirculated and affects cooling, i.e. thicker isn't always better.
The startup-viscosity is probably the least relevant in warm climates. Up here in the cold north it is crucial to avoiding initial engine wear.
I would think in engines which tend to run hot (i.e. inadequate cooling systems for the climate/use) full synth oil would be beneficial to avoid the smaller molecule chains from breaking down and creating sludge.



with some happy owner bragging how cheap it was, spit & polish and a full BMW Service History..... 

