Well, I think I've narrowed down my oil leak to the oil cooler but there isn't a bolt going through the center like the others I've seen on here or in the FSM. Looks like I need to use an allen wrench to remove the cooler. Anyone seen this before?

 

Picture, Also yr, engine please

 

Put your vehicle specs in your signature. I'm guessing you're 2wd. Look in the FSM for 2wd oil coolers. It's a different setup...

 

1989 ext cab 3vze auto trans 4x4. here is a picture I found. https://www.yotatech.com/forums/f116...-plugs-177898/