I take it from the wording, English is not your first language. To answer you outright, there is no reason to mix coolant and oil, under no situation where a vehicle is concerned.

If you are actually asking why oil would be fed through something containing coolant (radiator or such), the reason would be simple in that it is cooling the oil. By cooling the oil, the oil will stay viable longer as well as it will not want to build up sludge as much. It will also be able to cool the engine better, which means the engine itself will last longer. Using an oil cooler works especially well for supercharged or turbo-charged engines. 

I take it via the accident, the oil cooler was damaged in some way and it is now allowing oil to flow freely into the coolant? If so, about the only thing you can do is replace the oil cooler. You could possibly pick up a used one from an auto recycler for a lot cheaper than you could purchase one new.

What are the reasons to mix oil & coolant?


Any ideas how this can be done on a ASA? There was a sonicwall in place but it just died and we do not have a replacement besides this ASA. The 24.172.x.132 is a spam filter and I can't change the IP address. It needs to be able to access one server in the LAN.
