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"But to answer your original question, American or German? Japanese every time." Well, yes- if you want a leakproof engine, then Japanese is the way to go, no doubt about it.

Bear in mind that cars with 17-,18-,19-inch rims usually have uni-directional tyres on the rims. This means that the tyre can only be used on one side of a vehicle, since the tyres were made to rotate in only one direction at high speeds. Therefore, these tyres cannot be fitted to the other side of the car, even if they are the same size. Rotating this tye of tyre to the other side of the vehicle will almost certainly cause catastrophic tyre failure, so have a good look at what type of tyres you have before you rotate them.