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kjlem
You only need it for bushing and seal lubrication, so just use light for both. The heavy on the top of airspring will migrate to the lowers eventually anyway (presumably they suggest heavy so it stays a bit longer)
Ive used fully synthetic engine oil in mine before, it's loads cheaper and does exactly the same job. More recently I'm using Silkolene RSF instead which is equally cheap and available from most motorbike shops