Have you tried steam cleaning the engine bay then monitor to see if you can see any leakage. You have no puddles on the ground?

If somehow it managed to get into the engine through an intake line, a few ounces every other day should be evident by smoke from the tailpipe I would think.


1995 4Runner Limited V6 3.4 Liter 5 Speed 4x4
1995 4Runner V6 Auto 2WD