Been using D6 for long time.
The RL PS fluid looks to have a higher VI and higher viscocity at 100 degrees. So better heat stablitity which comes at the cost of lower flow.
So maybe RL PS is better for track? NOt sure if you'll feel any stiffness due higher viscocity.?
I think the D6 is fine for DD and range of tempratures specially for cold flow.
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