Just looking through the garage and I found an almost full can of the 8090 3M stuff. It is about 5 years old I think, do you think the stuff goes bad?? Was one can enough for most of you? Hate to buy another if not necessary.....and it's pricey $$

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1987 300TD 147,000 miles- Palomino leather interior, 1995 facelift and body cladding, E350 wheels, Rebuilt suspension and sport springs, rebuilt turbo, New Monarch injection pump and injectors....and the list goes on and on...