I have a coolant leak on my 1993 300zx with 190000 miles and im not sure what hose its leaking from, there is a hose that looks corroded that i think may be the problem, It leaks slowly when the engine raises in temperature and drips what looks to be rusty water onto the exhaust manifold below. my oil pressure seems to be a little low aswell, i looked up a forum on it and it said it could be the oil pump or the oil pan could have been dented at some point, do you have any suggestions on what might be the next step to fixing these, and are these common problems for an older nissan