Scott Oilers were conceived and designed when chains were "open" linked

Before the advent of "O" & "X" ring chains

These older "standard" roller chains needed lubricating "inside" the rollers

So a heavier flow rate was required for this type of chain to ensure that some oil penetrated "inside" the rollers

With the "sealed" type "O" & "X" ring chains only the sprockets and outer plates require lubing

Meaning a much reduced flow is required to deliver sufficient lube

Thats why I recommend the PDoiler as being electronic the flow rate is much easier to regulate