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No doubt, silicone oil is recognised as the best oil to use for RC due to the ability to resist changes in viscosity (measurement of fluids resistance to flow) due to temperature fluctuations - but the labelling can cause some confusion. So, what are the various ratings and are they equal? The most common ratings are cSt (centistoke) & WT (weight); cSt being the 'world-wide standard'. However, it appears when comparing the WT rating across different brands there can be differences in how that compares to the cSt rating. Below is a comparison chart to help you determine the cSt...

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