-4.6 Thunderchicken/Couger, right next to frame and no access hole
-early Navigators, front diff in the way
-3.6 DI or non-DI engines. directly next to front exh manifold/cat.
-new jeeps with minivan 3.8L V6, front suspension close together and my arms don't snake through.
-RX300/330/ES300/330 any other Toyota V6 similar to 3.0 or 3.3L, under exhaust manifold, AC lines in the way on RX as well.
-Montero or Montero Sport, 2 steel skid plates
-VW Passat, 20 million bolt skidplate
-newest body Tundra V8, canister filter right above something (I forgot what it was in the way).
-second gen or later Liberty/Nitro 3.7L, can barely get my finger tips on the filter, you have to be a contortionist.
-Chevy Aveo, oil filter directly next to exhaust manifold and cat, maybe 1/16 inch away.
I'm sure there are more. That is all that came to mind instantly.