What is the best oil to use with the engines as they have an integral gearbox and clutch?
Is it safe/good to use semi synthetic 10/40W oils that are specifically designed for car engines or do you really need to use 'motorcycle' specific oils or stick with a good old 20/50W?
Not looking for expensive/exotic oils just a good one for general use but there seems to many arguments about not using 'car' engine specific oils as the gearbox 'tears' it apart and possibly causing clutch slip, or is all this just marketing hype to get us to pay more for the same oil?