I recently added an oil cooler to my 97 GL.
I got a B&M Import Engine Oil Cooler.
It takes about half a quart extra oil.
A thermostat is an optional accessory.
I recomend leaving the stock one in.
Adding the sandwich adapter & thermostat didn't leave much room at all on my Zetec.
I just got a shorter filter for a similiar sized Engine.
I think the filter I ended up with was for a new Cavalier.
IMHO, benefits are notice-able.
