Quote:
Originally Posted by Redboots
Real mineral oil never wears out. Its all the additives that degrade.
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This ^
Mineral oil comprises a base oil plus additives that thicken as the oil heats up (and the mineral base oil gets thinner). That's how it achieves its "multigrade" rating. If you put car oil in a motorcycle with common engine and gearbox oil twat happens is the shearing action of the gear teeth rapidly breaks down the viscosity improvers and you end up with just the base oil which has the viscosity of p!ss when it's hot, with consequent degraded lubrication abilities.
Some car oils also contain friction modifiers which will make wet clutches slip.
In summary, don't use car oil in a bike unless there is absolutely no other choice, and then change it asap afterwards. It is not just marketing, they are different.
Synthetic oils are different as they are inherently more stable at temperature and don't suffer from reduced viscosity as mineral oils do. Hence they don't rely on viscosity improver additives, but same applies, use bike oil.
And to the (rather old now) original post, there is a KTM shop in Aktau.
http://motohouse.ddns.net/
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