If you know your car has a problem with engine overheating or you suspect something is wrong with your transmission, get it checked out ASAP. Finding a small problem now can save you thousands of dollars in the long run. If your car engine is overheating, this causes extra stress on the transmission as well because transmission fluid has to work under higher temperatures. Luckily, high quality synthetic oil, like AMSOIL, maintains fluid properties even at high operating temperatures. Some transmission fluids will degrade and change viscosity when subjected to high temperatures. ;