Just found this piece of information about KTM's reason for
requiring 10W-60 oil.
"Limited Availability of the Endorsed Motor Oil
KTM recently sent dealers a bulletin reminding them that the required oil is of 10W-60 viscosity and has the JASO MA rating. Oils meeting these requirements are not widely distributed in North America, and not even every KTM dealer is actively stocking or using the endorsed Motorex Cross Power 4T 10W-60 oil. Many people have reported using 50-weight oils with no discernible problems, but the bikes are fairly new and not many people have racked up a lot of miles on them yet. It would be safest to use the endorsed oil, especially while the bike is under warranty.
Note that there's some indication that KTM has used silver bearings in the new LC4 motor. Using silver, instead of lead, provides greater strength than any other bearing material, and it also resists corrosion better and is more thermally conductive. Silver bearings are more typically found in heavy duty marine diesels or jet engines. Unfortunately, the detergents in automotive and motorcycle motor oils (primarily ZDDP) will attack and eventually degrade silver unless they are specially stabilized. This may be the reason behind KTM's strong endorsement of the Motorex Cross Power 4T 10W-60."
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2011 Husaberg TE 300
2002 640 LC4e
Past Rides
'03 KTM 450 EXC (SOLD)
'01 Honda XR650R (SOLD)
'98 Honda XR600R (SOLD)
'95 KTM 620 RXC (SOLD)
'88 Yamaha TT600 (SOLD)
'86 Yamaha XT 350 (SOLD)
'84 Yamaha IT465 (STOLEN)
'83 Kawasaki KDX 450 (SOLD)
'83 Honda CB1000 Custom (SOLD)
'82 Kawasaki KDX 400 (SOLD)
'77 Yamaha DT200 (SOLD)
'70 Honda CT70 (SOLD)
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