SAE 25W-70
Classic Engine Oil 25W-70
High zinc for flat-tappet cams and generous clearances in classic engines.
API SF equivalent
Speciality & Classic
Classic & Speciality
Older engines were designed around older oils. These grades carry the additive levels, viscosities and seal compatibility that pre-1980 engines and gearboxes actually need.
4 grades in range
Why this range
Classic, vintage and speciality lubricants
Bohr Chemical classic and speciality oils are formulated for pre-modern engines that need higher zinc anti-wear levels, monograde viscosity and seal-friendly chemistry. These fills suit flat-tappet camshafts, running-in, and restoration work where modern low-SAPS oils are the wrong tool.
Higher ZDDP levels
Protects flat-tappet camshafts and lifters that modern low-phosphorus oils are not designed for.
Seal-friendly chemistry
Base fluids chosen to avoid swelling or hardening older seal and gasket materials.
Monograde availability
Correct viscosity behaviour for engines specified before multigrade oils existed.
Typical applications
- Veteran, vintage and classic engines
- Flat-tappet performance engines
- Engine running-in after rebuild
- Restoration and low-use storage fills
Featured grades
Most specified in this range
SAE 30
Veteran Monograde SAE 30
Monograde fill for veteran and vintage engines with splash or low-pressure feed.
Non-detergent option available
SAE 75W-140
Competition Gear Oil 75W-140
Race and rally differentials operating well above street sump temperatures.
API GL-5
Full range
All classic & speciality
SAE 25W-70
Classic Engine Oil 25W-70
High zinc for flat-tappet cams and generous clearances in classic engines.
Specifications
API SF equivalent
SAE 30
Veteran Monograde SAE 30
Monograde fill for veteran and vintage engines with splash or low-pressure feed.
Specifications
Non-detergent option available
SAE 75W-140
Competition Gear Oil 75W-140
Race and rally differentials operating well above street sump temperatures.
Specifications
API GL-5
ISO VG 460
Steam Cylinder Oil
Compounded oil for traction engines, steam launches and heritage machinery.
Specifications
Wet steam service
Common questions
Classic & Speciality FAQ
Why does a classic engine need higher zinc?
Flat-tappet valvetrains rely on a sacrificial ZDDP anti-wear film. Modern oils cap phosphorus to protect catalytic converters, which leaves those camshafts under-protected.
Should a rebuilt engine use a running-in oil?
Yes. A dedicated running-in fill helps bed rings and bearings, and should be drained early to remove assembly debris.
Talk to a lubrication engineer, not a call center
Send your equipment list and duty cycle. We will come back with a specification-matched recommendation and the data sheets to support it.