Marzocchi suggests Golden Spectro 125/150 wt oil (about 7.5 weight).
As long as you use a motocross fork oil that DOES NOT use detergents or seal swellers, you are fine. 7.5 weight is stock, going to thicker oil (higher numbers) will slow rebound somewhat, and sometimes compression. If you have a bottomout problem, raise the oil HEIGHT a little bit, that usually helps.
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