I have a 2011 honda pilot awd with a rod knock. The vin engine code is 4. I can find reasonably priced fwd engines with the code 2 but awd engines are much more expensive. Is there an actual difference between a awd and fwd engine? Also, would a 3.5 from an accord fit? I'd rather not fix the rod knock as it is a result of the engine being run low on oil. It went through 4 qts of oil in the 2k miles between me checking it and the oil light coming on so I don't know what other damage was done.