Penrite Gearbox 30 1Ltr

Penrite Classic Gearbox Oil (SAE 30 Equivalent)

Safe, reliable protection for classic gearboxes and overdrives

Penrite Classic Gearbox Oil is specially formulated for vintage and classic transmissions where SAE 30 engine oils were originally specified. Designed to protect delicate internal components, it is ideal for gearboxes containing yellow metals and classic overdrive systems.

Unlike modern gearbox oils, this formulation contains no EP (Extreme Pressure) additives or friction modifiers, ensuring compatibility with older materials and preventing damage or performance issues.

Key Benefits

• Correct for Classic Applications
  Designed for gearboxes originally specifying SAE 30 or 20W-50 engine oil.
• Safe for Yellow Metals
  No aggressive EP additives—protects brass, bronze, and phosphor components commonly found in classic gearboxes.
• Overdrive Compatible
  Prevents slipping in units such as Laycock overdrives, ensuring smooth and reliable engagement.
• Smooth Gear Operation
  Suitable for:
  • Straight cut gearboxes
  • Synchromesh transmissions
  • Pre-selector gearboxes
• Stable, Consistent Performance
  Maintains viscosity and protection under load without breaking down.

Important Note on Viscosity

Gearbox and engine oil viscosities are measured differently:

• This oil uses the engine oil viscosity scale
• Replaces SAE 30 and 20W-50 engine oils
• Roughly equivalent to an 85-weight gearbox oil

Applications

• Classic manual gearboxes
• Vintage transmissions with yellow metal components
• Overdrive systems (including Laycock units)
• Pre-war and post-war classic vehicles

Why Choose Penrite Classic Gearbox Oil?

Modern EP gear oils can damage synchros and yellow metal components, while friction modifiers can cause overdrive slippage. Penrite Classic Gearbox Oil avoids both issues, delivering authentic, safe lubrication exactly as classic transmissions were designed for.