Good Compression, Oil In Coolant

Howdy all,

Pretty much what the title says, a 1998 v6 automatic, I have good even compression across all cylinders but I am still seeing a lot of oil in my coolant, mostly collecting in the reservoir. My dipstick and oil cap look clear of contamination as well and so does my transmission fluid dipstick. Where should I look to as far as the source of the oil?

Thanks!