Mixing oil

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pap snoek

Pack Dog
Joined
Apr 25, 2009
Messages
279
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Bike
Yamaha XT 660 Z
So my bike came with 10w50 semi synth oil when i bought it.Checked the oil level today and needs a bit of a topup but i want to go to 10w60 full synthetic.Do i need to drain all the 10w50 semi or can i just add the full synthetic oil?Can you mix oils? ???
 
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