The ping test is how I timed my '87 5.0 Mustang. Usually ended up around 14 advance and required premium fuel. Absolutely would not run on ARCO, even their top grade, I usually ran one of the top tier brands.
On the 450SEL, I figured the low vacuum was due to tired rubber under the hood but I guess not.
Michael
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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120
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