This is what I use in mine. Description from their site
Redline 80W250 GL-5 GEAR OIL
Recommended for SAE 250 or where SAE 140 does not provide adequate protection
Alternative to Red Line Heavy ShockProof® in problem Nitro Drag Race Vehicles
Can be used in Model A, Model T vehicles and Antique/Classic cars calling for 600W
Reduces noise levels in Morgan 3 Wheeler bevel boxes
Excellent for off road use where SAE 250 is required
After using Millers EP140 for about 12,000 miles I tried the Redline 80W/250 and actually found it worse overall. The BB noise was slightly louder but over a slightly narrower rev range.
It's wasn't enough of a difference for me to swap back straight away but I went back to EP140 at the next BB oil change.
It's also worth noting that the Redline 80W250 isn't available in the UK so has to be ordered from the USA with a minimum quantity of 1 US gallon (3.785 litres).
