5w or 10w/30? Options

[mwpayne]

Just bought a '95 celica ST. Needs an oil change, is 5w/30 ok? Reason is I also have a 2002 camry that uses that, it would be nice to stock one oil for both cars..

[Elevindie]

hmmmm....well the way oil is classified is by viscosity. the "W" means winter. 5W-30 is a unit of measurement. The way oil is created is that it wasnts to be thinner in winter time and thicker in the summer. when the number of the oil decreses the thinner it gets (10w to 5W). so this means when you go to 5W (for winter or cold temptures) instead of 10W, is meaning that you are putting less cushioning of the parts in the engine, and could wear out faster. But the 30, which is the viscosity of the oil in the summer time, it would be the same. So it is up to you, if you want to have less protection in your celica, at the expense of organizing the oil in a way that you wont screw it up, is totally up to you. But it is possible.