ASTM 4739 Base Number Test - What It Tells You About Oil Quality The base number (BN) of in-service oils monitors the depletion of alkaline reserve additives and is a key indicator of oil quality. Base number is an important test to perform on engine oils due to the introduction of combustion byproducts into the…
Read more
ASTM 4739 Base Number Test—What it Tells You About Oil Quality
