SAE Viscosity Grade
Definition
The Society of Automotive Engineers (SAE J300) classification of motor oil viscosity: the 'W' number specifies low-temperature cranking viscosity; the trailing number specifies kinematic viscosity at 100°C. Multigrade oils (e.g. 5W-30) meet both specifications through base oil selection and viscosity index improver polymers.
Related terms
- Aroclor
- A series of polychlorinated biphenyl (PCB) commercial mixtures manufactured by Monsanto (US) and marketed as electrical insulating fluids. Aroclors are designated by...
- C30 17Alpha-Hopane
- The C30 pentacyclic triterpane used as the primary internal normalisation standard in petroleum biomarker fingerprinting. It is resistant to evaporation, biodegradation, and...
- Dissolved Gas Analysis (DGA)
- The analysis of gases dissolved in transformer oil (H2, CH4, C2H4, C2H2, CO, CO2) by ASTM D3612 or IEC 60599 to diagnose...
- GC-IRMS
- Gas chromatography isotope ratio mass spectrometry: compounds separated by GC are combusted (for 13C) or pyrolysed (for 2H) and the isotope ratio...
- GC×GC-TOFMS
- Two-dimensional gas chromatography coupled to time-of-flight mass spectrometry (Leco Pegasus instruments). The first GC column separates by boiling point; a cryogenic modulator...
- Hopane
- A class of pentacyclic triterpane biomarker compounds (C27-C35) in petroleum, derived from bacteriohopanetetrol in ancient sedimentary organic matter. C30 17alpha,21beta-hopane is the...
- Karl Fischer Titration (KFT)
- Coulometric or volumetric titration using Karl Fischer reagent (iodine / sulphur dioxide / base / methanol) that reacts stoichiometrically with water. Used...
- Unresolved Complex Mixture (UCM)
- The broad hump of hundreds of co-eluting cycloalkane and isoalkane compounds in the TIC of heavy petroleum products (diesel, heavy fuel oil,...
- Zinc Dialkyldithiophosphate (ZDTP)
- The primary anti-wear additive in motor oils, contributing zinc, phosphorus, and sulphur to the additive package. The Zn/P ratio and S/P ratio...
Explained in
- Petroleum Products, Lubricants and Transformer OilThe Society of Automotive Engineers (SAE J300) classification of motor oil viscosity: the 'W' number specifies low-temperature cranking viscosity; the trailing...