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FOAMING AT THE TRANSMISSION

I have a 1955 GMC M211 with the stock HydraMatic transmission. I know the transmission is supposed to use 30 weight motor oil. But should I use detergent or non-detergent?

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I have a 1955 GMC M211 with the stock HydraMatic transmission. I know the transmission is supposed to use 30 weight motor oil. But should I use detergent or non-detergent?

—Jerod Davidson

Always use non-detergent oil in these transmissions (unless they have been updated to use ATF). Detergent oil may foam and could cause serious damage.

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