Will try magnatec on sunday to see if this helps, thanks Stu.
Dave I was led to believe that castrol rs 10 60w was thinner than the above, must admitt i'm not to up on oil's myself, to quote what the guy at the garage said who fitted my followers ' this stuff is like piss' he has 2 cossies & said he runs both on 15-40w semi, thanks for your reply though mate.

Cheers Simon.