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Probably your best bet is the Bentley manual for the 996, which is in book form only. You can also look around for a set of the factory 996 manuals, but they are expensive and harder to find as they have been out of print for many years now. Be cautious about pdf files, they tend to be woefully incomplete and/or out of date (there were many updates to the originals over the years), plus as most are illegal copies of Porsche copyrighted intellectual properties, and subject to legal action. This website does not condone trading in such materials.1 point
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Porsche coolant is available in 1gal container https://www.sunsetporscheparts.com/oem-parts/porsche-antifreeze-3785-l-00004330575 You will need ~3gals if you flush out all the old coolant (~6gals). I think it's best to go with Porsche and not to mix with other coolant. If you want to flush out all the old coolant without removing too many hoses, I've developed a method for 996 that many have used and got great results. Perhaps you could adapt it to your Boxster.1 point