when i was cleaning the air filter i took off the tube before the trhottle body and after the airfilter box. i found a lot of grease on it. is this normal?

 

A lot of us have had oil in there...still undetermined where it comes from

Could be from too rapidly filling the oil...or from blowby pressurizing the "crankcase"

doesn't cause a problem...clean it out...and the MAF...or take it in and get them to fix it.

There is some speculation that the new breather fix for the Milky dipstick TSB will help this...ask your dealer