Lubricants — Technical & Standards
API, ACEA, ILSAC, SAE and base-oil fundamentals, plus spec-to-oil decision guides for B2B buyers.
73 articles · Newest first
Understanding ISO 4406 Cleanliness Codes: Setting and Verifying Contamination Targets
An ISO 4406 cleanliness code is a three-number string — such as 22/18/13 — that reports the particle contamination level of a…
Why Does Engine or Gearbox Oil Turn Milky White After a Service, and Is It Always a Coolant Leak?
A milky, creamy, or opaque appearance in engine or gearbox oil means water has become emulsified in the oil — fine droplets…
TDS vs COA vs SDS: Which Lubricant Document Answers Which Question in a Purchase Order
A Technical Data Sheet (TDS) answers "will this product fit my equipment spec?" with typical, non-batch-specific values. A Certificate of Analysis (COA)…
Synthetic vs Semi-Synthetic vs Mineral Oil: A Procurement Comparison Beyond the Marketing Label
Procurement teams often treat "synthetic," "semi-synthetic," and "mineral" as fixed technical categories. They are not. These are marketing terms whose scope varies…
How to Write a Lubricant RFQ That Gets Accurate Supplier Quotes: A B2B Buyer’s Template
A lubricant RFQ produces accurate, comparable supplier quotes only when it specifies seven things up front: exact product identification (family, viscosity grade,…
Petrol Engine Oil API Classification: SF, SL and the Interval Myth
Petrol (gasoline) engine oil is classified under the API "S" — Spark-ignition — service-category system, a ladder running from long-retired letters such…
Diesel Engine Oil API Classification: The Interval Myth
Diesel engine oil API classification runs on two independent axes buyers often conflate: the API service category (CK-4, CI-4 PLUS, CF, and…
Specialty Greases: Types, Uses & Sourcing Guide
Specialty greases solve one narrow operating problem each — incidental food contact, extreme cold, high-speed low-noise bearings, fastener assembly, exposed open gearing,…
High-Temperature Grease: A B2B Sourcing Guide
A high-temperature grease is a lubricating grease engineered so its thickener structure, base oil, and additive package keep working — resisting oxidation,…
Multi-Purpose Grease Guide: NLGI 2, Specs & Sourcing
Multi-purpose grease is a single lubricating grease — almost always an NLGI (National Lubricating Grease Institute) 2 lithium-soap or lithium-complex formulation with…
EP Grease Guide: NLGI, Tests & Sourcing | Altonex Global
EP (extreme-pressure) grease is a lubricating grease formulated with additives that build a sacrificial protective film on metal surfaces under heavy, shock,…
Transformer Oil Buyer’s Guide: Standards, COA Tests & Export Sourcing
Transformer oil — also called insulating oil or dielectric fluid — is a highly refined mineral or ester-based liquid used inside transformers,…