I know from previous experience on various other forums there is no definitve answer to oil questions in fact its unusual to even get 2 people to agree on oil. My question is I have noticed on other forums a lot of people seem to think that the mobil one vee twin oil is the best oil to use on Buells and Harleys in all 3 places, I have used the Harley mineral oil as recommended over the Summer doing about 2000 miles, what is the opinions on changing to the fully synthetic oil from mineral oil, any problems ? any advantages?

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Buell S1 Lightning
Triumph Rocket3
Suzuki GT750
Kawasaki H1B
Honda 400 Four
Royal Enfield Bullet Diesel.
Kawasaki Z1300 ( current project)

it costs more.

....and even though it's rated at 20/50 it gets piss thin when hot and the hydraulic lifters don't like it, they bleed down resulting in more top end noise.....I can always tell a bike running full synth when they pull up outside my shop !

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Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR

I have just used Morris Lubricants Race V Twin 20w 50

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Dusty 001

So Better just to stick with the Harley stuff then , my bike has run great all summer with it.

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Buell S1 Lightning
Triumph Rocket3
Suzuki GT750
Kawasaki H1B
Honda 400 Four
Royal Enfield Bullet Diesel.
Kawasaki Z1300 ( current project)

i have been using Silkolene V-Twin 20w50

Castrol classic 20/50 in mine

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Last year I joined a group for anti-social people
We haven't met yet.

When my air cooled Citroen was getting to a high mileage, a mechanic recommended Valvoline refined mineral 20/50 Racing Oil, which by coincidence is suitable for some Harley Davidsons. Not sure which Harleys that means though!