Engine oil is fine, it is recommended by many factory service manuals for older bikes, and I haven't seen that the foam is much different.
I noticed that older factory service manuals would recommend regular oil for maintenance (cable lubrication, filter oiling, chain lubrication, etc...) rather than the array of specialized products they now sell. When I am travelling long term I use the liter of engine oil I'm carrying anyway for everything maintenance related.
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