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I recently replaced my engine mounts on my 1989 Porsche 928 S4. It was a complete nightmare. I believe most 928 owners will tell you they are permanently traumatized after replacing them. My original mounts were worn enough that it would cause the floor boards to produce alot of heat. I used some solid rubber mounts that I got from a company called 928 motorsports. The Porsche brand cost over $400 each, the 928 motorsports brand cost around $100 for both of them. On this vehicle you have to support the engine so it does not sink down when you remove the cross member. I ruined several t-shirts due to the mass amount of engine gunk that was on everything. After removing the crossmember I found out I was actually missing two metal plates. Luckily I found some used ones from 928 International very cheap. This was a very hard task to do but I now believe I can replace anything on this vehicle. I did have to drain the oil and remove the filter. I also installed a three piece cross member. This allows for me to replace the gasket without removing the cross member because the center of it comes out. I will be using AMSOIL ZROD 20W 50. This is a high Zinc Oil. The Zinc levels are important on this Porsche Engine because it can prevent alot of wear. When I replaced the oil gasket I was surprised to not see any rust on the connecting rods.