So as i was driving home today almost to my house from work I started hearing a constant knock sound coming from the internals. When i got home i immediately turned the car off, went and got some thicker weighted oil to put in it and some Lucas Gear oil then proceeded to change the oil.It seemed to have quietened the knock down a tad but it's still obviously still knocking. It is a 2013 wrx sedan with about 143,000 miles on it. Cobb stage 1+, I am almost positive it has spun a rod bearing. Can you replace the bearings by dropping the oil pan on these cars? Didn't know if it would be possible where it's a boxer engine, any help will be greatly appreciated.