hello I have a 96 gl1500 trike I am new to trikes and I noticed that it shifts kinda hard just like my old Harley it clunks into gear just got the trike and was told they used 20w 50 oil I think that might have something to do with it cause it should have 10w40 correct it has just over 16,000 miles on it thanks let me know what you all think Jason from pa