I was asking about Mobile 1 MC oil and the sales guy says Royal Purple is on sale for $8.00 a qt. so I bought out their stock ... I have 7,500 miles on a some 20-50w Purple and the bike shifts like butter , I'm going to send in a sample to Blackstone and have them check it out to see If I need to change, I run my 2005 GMC 5.3 conversion van 15,000 before change
who said $$ oil is more $$ they don't uses it properly