Is This DOT4 Or DOT5 In The Syringe? - UPDATED

Getting ready to flush some brake lines on a bike that came from the factory with DOT5, but it’s not uncommon for folks to switch over to DOT4.

I bought DOT5 just to be sure, but I have never worked with DOT5 and have NO IDEA what it looks like when it’s this old. He bought it six years ago from a widow that lost her husband two years prior, so the last time the bike was serviced (before my buddy got it) was probably 2005-2007 when the bike was five years old.

Now I’m not sure what to put in there.

I’m reading that DOT5 turns a yellowish color when it ages.

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Update #1:

I mixed it with some fresh DOT4, and this is what it looked like five minutes later.

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Update #2:

I mixed it with some fresh DOT5, and this is what it looked like five minutes later. No separation.

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It turned out to be DOT5. Also, since the motorcycle only had 10K miles on it when he bought it, I’m guessing the last person to put brake fluid in that bike was Harley Davidson when it was on the assembly line.

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