I'm fairly sure that Carls uses non-Synth fluid in their shock rebuilds/upgrades for the WE shocks.
They are often on the forums here and may chime in if I'm not correct.
Using higher quality oil with valving and orifice size combo's that do not 'singe' the oil in the first place can go a long way.
Rogers sport center does use the Full-Synthetic shock fluid in their rebuilds/upgrades.
https://www.rogerssportcenter.net/
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Curious, why is everyone so set on a full synthetic being superior in a sled application? Any good shock oil will do the trick considering heat management is not an issue for mountain sleds.
The real issue is valving. Improving flow will decrease friction, preserve oil longer and keep things a lot happier. I don't see friction being high enough, nor heat being high enough to break down the longer polymer chains into smaller ones.
Another way to think of it is in terms of truck shocks. Most people aren't too concerned about rebuilding these after even 10,000 miles. Most come with a conventional oil, and they stay relatively consistent.
If we are racing trucks in Baja or running the snowcross circuit, totally different story. But we aren't.
End of the day, valving is the important part. Type of oil, not really that important so long as its a specific shock oil from a reputable manufacturer.
People may disagree here, but I've rebuilt stuff with both. End of the season, I can't tell a difference.
