Steve Ray has a list of 35 loaded Questions for "Bible Christians" (quotation marks his)(link to the whole list). This is number 4/35. I'm trying to provide the answers in a common format, for easy reference.
4) Some Protestants claim that Jesus condemned all oral tradition (e.g., Matt 15:3, 6; Mark 7:813). If so, why does He bind His listeners to oral tradition by telling them to obey the scribes and Pharisees when they “sit on Moses’ seat” (Matt 23:2)?
1) We don't necessarily condemn oral tradition.
2) Jesus' binding of his listeners wasn't absolute. In fact, when Jesus' listeners came before the scribes and Pharisees who sat in Moses' seat they responded:
Acts 5:29 Then Peter and the other apostles answered and said, We ought to obey God rather than men.
1) "Oral tradition" can refer to various things. There's a sense in which the minister preaching the gospel is tradition-ing (passing on) the word of God in an oral form. This in itself is not a problem, but it should never be given an authority equal or greater to the Word of God itself.
2) If the Roman Catholics want to suggest that the Pharisees and Scribes had the same kind of authority as the Roman Catholic Church has, we simply note that Jesus himself opposed the traditions of the Pharisees and Scribes.
3) The danger of human traditions corrupting theology were not a problem only for the Old Testament times:
Colossians 2:8 Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ.