ok i brought it to the shop and they tightened it, i really didn't want to break anything. without mentioning it's what i was getting, they confirmed that 13.6v was about normal for the older models, when at 2000rpm, since the alternators are not the strongest.

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w123
1985 300D turbo sept 2015 - present
1985 300TD turbo oct 2023 - present
looking for biodiesel in nyc