Milky oil suggests it ate some water. Not good, usually it means the engine needs major repair or replacement as water does not compress. First change the oil (use whatever cheap oil that matches the weight called for, you may be working on a dead engine so no reason to put $50.00 oil in it) but you also do not want to keep circulating water through it.
Stick a spark tester on one and four to see if they are actually generating a spark or not.
Then run a compression test and see what you have in each cylinder. You want all four to be within the same range (175psi in each would be good 160 will work) I am going to guess they will not be in spec. (Hope I am wrong) If they are not run a leak down test and see where the leakage is.
As for the possible problems - bent con. Rods, holed/cracked pistons, holed/cracked head, blown head gasket.
Good luck, post back with results of tests.
Friday, December 2nd, 2016 AT 5:05 AM