re: How do you lower crude oil's viscosity to get it through pipelines faster?

Usually they blend. There is a quality bank for each pipeline. If your product doesn't reach a certain spec you can't flow through the pipe. Therefore, you add lighter hydrocarbons to reach that spec to flow.

Condensate

So who won the gift card, or is this not that type of thread?

Keeping it over 120 degrees Fahrenheit and adding some kind of thinner will do the trick.

is this for your science project?

do your own research

Company I am with now will mix it with diesel or a cutter stock to raise the viscosity/api and heat it up to pump it. But it's not just through a pipeline. They are moving it from tank to tank or barge to tank using pipelines in between.

Temperatures are usually 250 degrees or greater. Some times over 325 degrees from what I have seen from inspection reports.

Check the video out at the bottom of this page. Pretty informative but a word if caution, there is a sales pitch for Nalco's viscosity reducer.

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So if you producing oil 126 Miles OCSG and you floating in 6,500' of water, wouldn't the oil cool off in the pipeline by the time it hits the bottom of the gulf?

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I'm a pipeline engineer and 95% of my experience is onshore. With that said I would answer your question, yes. But it's just a heat transfer problem to determine the location along the pipeline where pipeline temp = ambient.