1977 320i - leaded vs. unleaded gas - BMW Forum - BimmerWerkz.com

3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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post #1 of 2 (permalink) Old 04-08-2010, 09:10 AM Thread Starter
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1977 320i - leaded vs. unleaded gas

Just acquired a 1977 320i with 100k miles on it, It's in very good shape and was well taken care of. The previous owners, same family owned it since it was new - went from the father to the daughter, put lead additive in the gas with every (most) fillups. Is this necessary? What happens if I discontinue doing this?
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post #2 of 2 (permalink) Old 04-09-2010, 04:09 AM
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You will burn the valve seats out...if you dont keep adding the additive, you can have it adjusted to run on unleaded, think they do something to the timing, I cant really remember,long time since I had one done.


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