I presume the issue is 'can I find them easily, especially if I don't have a dealer nearby?' You may want to plan ahead and order from any number of Internet sources including several of the excellent dealers who support this forum. If not, please refer to the many oil threads already existing!
If your key concern is readily available
, then you might consider the Liqui-Moly 10w60 sold at NAPA (available in 5 liter jugs for an attractive price). Not all stores have it in current stock, but it can be obtained quickly from hub stores or warehouse locations, usually in 2 days or less. See https://www.napaonline.com/en/p/AOCLM2024_0290960101
. Amsoil carries a 10w60 that's got good availability as well, though for some reason they label it as being for dirt bikes (likely they have a KTM rider in their marketing department). The Amsoil is a bit pricier, but you can get a discount with a larger purchase or by being a regular customer. See https://www.amsoil.com/shop/by-product/motor-oil/motorcycle/synthetic-sae-10w-60-dirt-bike-oil/
. Note that the Amsoil is suitable for wet clutch applications as well, where the Liqui-Moly is for dry-clutch use only.
For gearbox and final drive, I suggest Mobil1 75w90 - available at many automotive stores, this is a full synthetic that carries the specs for both sections of the drivetrain, allowing you to just keep a liter on the shelf for use as needed. See http://www.oreillyauto.com/site/c/detail/MOB4/MOBIL1GEAR/N2365.oap?ck=Search_N2365_-1_-1&pt=N2365&ppt=C1985
. There are similar products from a number of other reputable sources, but this one is easy to find and defnitely meets both specs. Some others meet one or the other but not both.
Note that there are a number of other good oils for these applications - for example, I like ELF/Total too - but they may not be as easily found nor as reasonably priced. I have used the Total and then the Liqui-Moly (when the Total brand became harder to get) in combination with the Mobil1 gear oil in my Norge for 120,000 miles and I see no oil-related problems or degradation.
For an obvious add-on, the most readily available quality filters that fit the bike are the Mobil1 M1-102 and the Bosch (I can't recall the number). Again, there are a number of good filters out there including the Wix and others that some riders like, but these two are high quality filters that can be found at normal auto parts stores or even Walmart.