I have a '99 SR5, 3.4L 4WD with 132K. I went to change the oil the other day for the first time (usually had the dealer do it) and noticed a few drips. After removing the smaller skidplate to get to the oil plug, I noticed oil all over everything around the front end. It was only about a half court low so it wasn't a big leak, and I did notice oil underneath the filter which may be from them not tightening it enough which I'm hoping. The valve covers and headers are all spotless so that's not the source. What do y'all think? Could it be a main seal? Does this ever happen on these rigs? Thanks!