Is synthetic motor oil okay?

We have been through this before. There are the guys who only use bike oil ($5/qt). There are those of us that use car (i.e Castrol GT) oil at $1.50/qt. And there are those that use Mobil 1. Everyone supports their choices. Now the rest is up to you.

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99 WR

A friend of mine who owns a YZ400 uses nothing but synthetic oil and has had no problems. I have heard others claim this is bad for the clutch plates. What do you guys use?

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