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Absolutely do not do it. Your car has an air filter, right? lol. The front side is always clean. Over time, the back side of the throttle body...
I know this is older but this is a VERY common failure mode. Headgasket causes mild hydrolock from water intrusion into the cylinder, probably...
Additional weight in the form of.... well.... weights hung off the frame will do nothing for safety and have the potential for making it less...
Regarding Duralube, I'm going to look at what it is but many times, these additives are big blobs of viscosity index improvers (VIIs) which is not...
You can mix weights and brands, sure... But if you find the right oil for your conditions, there's no need to mix. Plus, mixing weights is one...