This is a pretty dumb question cause it's common sense that it's going to be viscous since they haven't been direct drive belt driven for several plus decades.
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That makes it a fantastic question, in my books. Not everyone knows. Not everyone's game enough to ask for fear of appearing stupid. TCM would not have been alone - for every person that asks a question, there are dozens of people out there (probably many more than that) who are looking for the answer to that question.
Here's something along those lines: there was a time recently where some young adults in Melbourne were learning to drive or had gotten their P's and had NEVER seen rain. Didn't know what a wet road was, or what it would do to the car.
On the surface, the members of this forum answer questions to people that ask the questions. What we don't (won't, ever) see is underneath, where search engines provide results for questions that people have, they type stuff into Google/Duckduckgo/Ecosia etc and get results that point to these pages.
A great many of those people never sign up to the forum. At any one time (example: right now) we'll have over 100 "users" connected to the forum. At the moment, that's 3 people with accounts (myself included), several dozen people here as a result of search engines, and the rest are search engines.
So what we see here only scratches the surface. There are many, many other people out there reading what we're saying and taking notice, and we'll never know. And many of them learn from their experience.
On occasion you'll get someone jump on the forum and say "long time reader, first time poster". I'll get the occasional PM from someone who got enough help from the forum to help them out considerably (eg catching a timing chain failure before it blows the motor, or cleaning the SCV for $25 vs replacing the fuel pump for $4K).
While the question on the surface looks odd, or ill-informed, it really is a good question because LOTS of people don't actually know - or didn't, because now they do!