How much oil do I need to put into my electric 2.5hp, 4 gallon air compressor?
I've already added one litre...do I need to put in more or is that too much? It doesn't have a gauge or a dip stick. The compressor was a gift and didn't come with a manual, and the brand is one of those generic brands (probably out of China) called American Force (no, not from the tire company). Any ideas?

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