Viscosity measurements & temperatures are more accurate between manufacturer's for engine & gear oils not so, apparently, for many suspension & fork oils.
For fork oils & suspension fluids, the various manufacturer's do not agree on measuring viscosity sometimes they don't do more than give some sort of approximate SAE grade value. especially the full synthetic or part synthetic fork oils. Due to how specified, & lack of stiction fighters & other characteristics, you are better off with a real fork oil like Spectro's. They are of good quality, have low stiction, wide temperature range (excellent viscosity index), & the viscosities can be depended upon. I prefer Spectro's fork oils and suspension fluids. This article applies to Pre-Airheads, Airheads, Classic K bikesĭiscussion of oil types and characteristics: The following section should be used with:
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