Well thats good,the builder should have no problem finding the source of the oil,post up what you find.It sounds like it was a leak from the front cover gasket possibly.
Orangefinger how did it run before you found the oil in the cover.
Did it backfire at all ?
One good backfire can pop a seal.
If it fails the leak down test.
I would remove the crank and coupler flip the motor split the cases and change the seals,use grease on the i.d. of the seals
Clean the...
If theres oil in the front cover you need to change the oil seals.Do a leak down test to confirm you have an air leak.If your front seal is gone it wont hold air.
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