Reading the service manual I found this information (P 2-12):
"After cleaning and drying the chain, oil it with a heavyweight
engine oil.
CAUTION
Do not use any oil sold commercially as "drive
chain oil", this type of oil can such oil can damage
the "0"-rings (or seals)."
According to this , using my regular chain oil (Motul C4) I might damage the chain ????
Any comments ?