When I bought my Benz I was happy to see a MB battery and new MB brake master cylinder. As well as a few other new parts.

But with green goo installed for coolant, I am worried that DOT 3 may have been used. The car calls for DOT 2.

Can I assume they should not be mix? And if not, is there a way to tell them apart? The current fluid color is a light gold.

I have a very, very slow leak. I finally found it doing the ball joint but do not have the time or luxury to rebuild the calipers. And the fluid is starting to get lower than I care for. Need to top it off until I do all the brakes.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car