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1978-1995 Oil/Transmission additives

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Vehicle Information: Year: 1987; Engine (size, modifications): 5.0l v8; Total Mileage: 112,000; Transmission type: Autotomatic;

What are your thoughts on using oil and transmission additives? I noticed the owners manual said no oil additives, but made no mention of transmission. I suspect that additives have come a long way over the last twenty years, so are they good to use...I bought Slick 50 transmission additive for high mileage vehicles and Valvoline oil additive.

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