I turned 3000 miles on my '15 KLR yesterday .....time for some maintenance such as an oil and filter change (its under warranty so a Kawasaki filter with 15w40 Rotella oil), cleaned the air filter, mounted a new rear Shinko 244 (being extra careful to not scratch the black rims), greased the open sided wheel bearings/spacer between the sprocket carrier and hub, and then got down to business with the swingarm/shock linkage/bolts and sleeves.
I've only washed the bike 2 times in three months and it hasn't seen any stream crossings yet......but, the swingarm pivot bolt and the shock knuckle/rocker bolt already had noticeable corrosion as others have noted. Neither of these bolts were hard to remove, were cleaned up, and lubed with a little anti seize topped with waterproof grease to help keep corrosion at bay. All other bolts, sleeves, and bearings were greased and reassembled.
I've owned numerous KLRs in the last 25 years and all have needed this service within the first 5000 miles....earlier if you intend to ride the bike off road through water. I waited until the OEM rear tire was worn out so I could do everything at the same time.
The front tire will be worn out around 7000 miles and at that time the steering stem bearings will be cleaned, greased, and adjusted to the proper preload. Plus, the fork oil will be replaced and the inner workings of the forks cleaned.
Next up is a valve clearance check and/or shim around 5000 miles. The bike has already received the Eagle Mike doohickey and torsion spring at 2000 miles.
In other words..........grease your KLR where needed as soon as possible.