I'll try and get this right so please don't flame me if not:
Armor-all is a popular product as is STP Son of a gun, the draw back(imho) is it's petrolium based(think that is right) which actually causes deteriation/dry rott. I use to show a truck and sprayed gallons of that stuff on tires, engines and everything else. I wondered why after seemed like a short time my tires looked dry and cracking? It's the Armor-all! Looks great at first but over time is BAD! And this is for ANY make/model car, bike, truck.

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2006 Jetta TDI DSG 320k miles
1997 Ford F150 325k miles 4.2L V6 "Work Truck"
2008 Tundra 225k miles 5.7L
1982 240D.....sold
1984 300D...Totaled OUCH!
1985 300D Turbo 222k miles "Dos" sold to 79Mercy
1986 300SDL 98K miles "The Beater"....sold
1987 190E 2.3 16v Euro spec 115K miles....sold