Personal experience ko naman is when you take out the timing belt cover, basa ng oil mismo yung timing belt. Masama daw ito dahil it weakens the timing belt and shortens its service life. Ang pinalitan e yung oil seal sa me likod ng timing belt. Check mo na rin kung basa ng oil ang timing belt to be safe.

My ride is a Mazda B25 pick-up.:wink: