Originally Posted By: 87sammy
Between those 2 use the GN4. I have ran both with the Valvoline bike seems to run hotter and shifts are stiffer. That being said. I have been using Shell Rotella T 15w40 for 2yrs in a 2001 TRX350FM , 2007 CB900F7 , 2008 TRX450ER with no issues.
ive had the exact opposite experience, my small bike has had a steady diet of GN4 for 6 years, switched to valvoline Motorcycle specific 10-40 and the bike seems to shift better. I noticed no difference in temperature readings. I do think Honda GN4'S are a very bland oil.. better can be had for the same $