Latest list with all editions and spell checks.
AAP = Advance Auto Parts
ADBV = Anti Drain Back Valve
AF = Air Filter
API = American Petroleum Institute
API-TC = 2 cycle, air cooled engine oil specification
AW = Anti-Wear
AZ = Auto Zone
BBC = Big Block Chevy
BITOG = Bob Is The Oil Guy
BOGO = Buy One Get One Free
BP = British Petroleum
CAFE = Corporate Average Fuel Economy
CEB = Castrol Edge Black bottle/with Syntec
CEG = Castrol Edge Gold
CEL = Check Engine Light
COF = Coefficient Of Friction
COP = ConocoPhillips (makers of MotorCraft/Kendall/Philips66 and others)
cP = centiPoise - a unit of absolute viscosity
CRD = Common Rail Diesel
CSK = Cold Start Knock
CSK = Checker, Schuck's, and Kragen, auto parts stores now called O'Reilly's
cSt = centistoke - a standard unit of kinematic viscosity
Dino = Regular/conventional Motor Oil(s)
EOS = Engine Oil Supplement by GM, Engine Assembly Prelube for piston and lifter scuffing as well as the camshaft
EP = Extreme Pressure additive, reduces ware
FAR = Free After Rebate
FF = Factory Fill
FF = First Fill
FLAPS = Favorite Local Auto Parts Store
FS = Formula Shell
Fuchs = European MFG of quality lubricants
G-oil = GREEN Motor Oil, from Green Earth Technologies
GC = German Castrol...Castrol Syntec, It will say "Made in Germany" on the back. New name, changed to Castrol Edge
GM = General Motors
HDEO = Heavy Duty Engine Oil
HDMO = Heavy Duty Motor Oil
HM/HMO = High Mileage/High Mileage Oils
HTHS = High Temperature, High Shear rate viscosity
IDK = I Don't Know
IDR = I Don't Recall
IIRC = If I Recall/Remember Correctly
IOLM = Intelligent Oil Life Monitor. As opposed to Ford's original, simple mileage counter
ISO = European Standards
J300 = SAE engine oil viscosity classification standard
JASCO = Japanese Standards
KV = Kinematic viscosity, is the ratio of absolute or dynamic viscosity to density
LIM = Lower Intake Manifold
LOS = Lucas Oil Stabilizer
M1 AFE = Advanced Fuel Economy
M1 EP = Extended Performance
M1 ESP = Emission System Protection full synthetic diesel oil
M1 = Mobil 1, all Mobil 1 oils are full synthetic
M5K = Mobile 5000 mile Dino oil, discontinued
MC = MotorCraft...Not Mobil Clean
MM = Maintenance Minder
MMO = Marvel Mystery Oil
MOA = Motor Oil Additive
MOFT = Minimum Oil Film Thickness
MOS2 = Molybdenum Disulphide
MS5k = Mobil Super 5000
NMMATCW3 = National Marine Manufacturers Association
MSDS = Material Safety Data Sheet
NOACK = A volatility test that determines the evaporation loss of lubricants in high-temperature service
OBD = On-Board Diagnostics/engine codes
OCD = Obsessive Compulsive Disorder
OCI = Oil Change Interval
OCOD = Orange Can of Death
OD = Over Dose
OEM = Original Equipment Manufacturer
OLM = Oil Life Monitor
OP= Original Poster
OP = Oil Pressure
OPE = Outdoor Power Equipment
O'R = O'Reilly Auto Parts
OT = Oil Temperature
OUO = Oil of Unknown Origin
P1 = Pure One oil filter
PAO = PolyAlphaOlefins, , a base stock for oils
PEA = PolyEther Amine, the active ingredient in fuel system cleaners such as Techron, Redline, Sil and Regane HM
POE = Polyol Esters, a base stock for oils
PC = Petro Canada
PCMO = Passenger Car Motor Oil
PDS = Product Data Sheet
PO = Previous Owner
PP = Pennzoil Platinum
pp = pour point, is the lowest temperature at which a liquid becomes semi solid and loses its flow characteristics
PPD = pour point Depressant - additive that retards wax crystallization - lowers the pour point
PU = Pennzoil Ultra
PYB = Pennzoil Yellow Bottle
QSDefy = Quaker State Defy
QSED = Quaker State Extended Durability
QSGB = Quaker State Green Bottle
QSUD = Quaker State Ultimate Durability
RL = Red Line oil
RP = Royal Purple
RPVOT = Rotating Pressure Vessel Oxidation Test
SBC = Small Block Chevy
SLOB = Street Legal Oil Boost by CD-2 and others, high levels of Calcium, Phosphorus, and zinc
SLOB = Street Legal Octane Booster
SOPUS = Shell Oil Products United States
ST/STD = SuperTech/SuperTech Dino
STS = Super Tech Synthetic
TAN = Total Acid Number -- oil analysis
TBN = Total Base Number -- oil analysis
TC = Spec for low ash 2 cycle air cooled engine oil
TCW3 = Spec for no ash 2 cycle liquid cooled engine oil, W means Water cooled
TOST = Turbine Oil Stability Test, ASTM D-943
UCL = Upper Cylinder Lubricant from Lucas, Restore, DuraLube, and others, a gasoline additive
UIM = Upper Intake Manifold
UOA = Used Oil Analysis
US0 = use search option
VDB = Valvoline DuraBlend
VI = Viscosity Index, an arbitrary measure for the change of viscosity with temperature
VII = Viscosity Index Improver, these compounds make it possible to make multigrade oils
VML/ML = Valvoline MaxLife/MaxLife
VOA = Virgin Oil Analysis
VSET = Valvoline Synpower Professional Engine Treatment
VSOT = Valvoline synpower oil treatment 15 oz VSOT (Valvoline Synthetic Oil Treatment)
VWB = Valvoline White Bottle
WPP = Warren Petroleum Products
XOM = Exxon Mobil
YMMV = Your Milage May Vary
ZDDP = Zinc Dialkyl Dithio Phosphate - main use as an anti-wear additive