Has anyone used these products? I have used both in my Mazda tranny and engine, with great results. The tranny would shift hard, and shudder in 4th, but after flushing with seafoam, shift perfectly. The seafoam in the brake line booster smoothed the idle. Now should I use these in my diesel engine, and in my tranny that shifts hard?

Sorry if this is already a thread that has been answered

Nick, First you need to list what year and model car you are asking about. If you have an '80's benz then the shifting harshness can be fixed by checking vacuum adjustments. I wouldn't add anything until all perameters have been checked.

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.