Here is the latest updated list.
I could not modify my first post to add this to it.
Lots of smart people out there finding mistakes and additions for this list, keep up the good work.
202 = A type of power steering fluid made by Pentosin and used in many European cars
AAP = Advance Auto Parts
ADBV = Anti Drain Back Valve
AF = Air Filter
AFAIK = As Far As I Know
ANSI - American National Standards Institute
API = American Petroleum Institute
API-TC = 2 cycle, air cooled engine oil specification
ATF = Automatic Transmission Fluid
ATF+4 = Current Chrysler Automatic Transmission Fluid
AW = Anti-Wear
AZ = Auto Zone
BBC = Big Block Chevy
BF3 = Break Fluid Dot 3
BF4 = Break Fluid Dot 4
BITOG = Bob Is The Oil Guy
BOF = Body On Frame
BOGO = Buy One Get One Free
BP = An oil company formerly called British Petroleum
CAFE = Corporate Average Fuel Economy
CEB = Castrol Edge Black bottle/with Syntec
CEG = Castrol Edge Gold
CEL = Check Engine Light
CHF11S = A type of hydraulic fluid made by Pentosin and used in many European Cars
COF = Coefficient Of Friction
COP = ConocoPhillips (makers of MotorCraft/Kendall/Philips66 and others)
cP = centiPoise - a unit of absolute viscosity
CQ = Carquest
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
DCT = Dual Clutch Transmission. It combines advantages of automatics and manuals, and takes a special fluid, not ATF or gear oil
DI = Direct Injection
Dino = From Dinosaur meaning old. Slang for regular/conventional Motor Oil(s) derived from algae and plankton
DKDC = Don't Know, Don't Care
DW = Driveworks (filters)
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
FSI = Fuel Stratified Injection
Fuchs = European MFG of quality lubricants
FWIW = For What Its Worth
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
GLO = Gear Lube Oil
GM = General Motors
HDEO = Heavy Duty Engine Oil
HDMO = Heavy Duty Motor Oil
HDS = Havoline Deposit Shield
HF=Harbor Freight
HM = High Mileage (anything)
HM/HMO = High Mileage/High Mileage Oils
HOAT = Hybrid Organic Acid Technology - Zerex G-05 antifreeze, extended life - five years or 150,000 miles , low-silicate, phosphate-free
HTHS = High Temperature, High Shear rate viscosity
IDK = I Don't Know
IDR = I Don't Recall
IIRC = If I Recall/Remember Correctly
IMHO = In My Humble/Honest Opinion
IMO = In My Opinion
IOLM = Intelligent Oil Life Monitor. As opposed to Ford's original, simple mileage counter
IRL = In Real Life
ISO = International Standards Organization
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
MG = Microgard (filters)
MM = Maintenance Minder
MMO = Marvel Mystery Oil
MOA = Motor Oil Additive
MOFT = Minimum Oil Film Thickness
Moly = is slang/abbreviation for Molybdenum (Mo) an element, part of an oil additive to reduce friction
MOS2 = Molybdenum Disulphide
MS = Mobil Super
MSS = Mobil Super Synthetic
MS5k = Mobil Super 5000
MTF = Manual Transmission Fluid
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
OAT = Organic Acid Technology - DEX-COOL antifreeze, extended life - five years or 150,000 miles
OBD = On-Board Diagnostics/engine codes
OCD = Obsessive Compulsive Disorder
OCI = Oil Change Interval
OCOD = Orange Can of Death, Fram oil filter
OD = Over Dose
OEM = Original Equipment Manufacturer
OLM = Oil Life Monitor
OLMS = Oil Life Monitoring System
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
PHOAT = Phosphate Hybrid Organic Acid Technology - Used in Mazda-based Fords (2008+),Dark green Embittered (so animals will not drink it)
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
PS = Power Steering (system)
PSF = Power Steering Fluid
PU = Pennzoil Ultra
PYB = Pennzoil Yellow Bottle
PZ = PennZoil (anything)
PZHM = PennZoil High Mileage
QS = Quaker State (anything)
QSDefy = Quaker State Defy
QSED = Quaker State Extended Durability
QSGB = Quaker State Green Bottle
QSUD = Quaker State Ultimate Durability
RL = Red Line oil
RLI = Renewable Lubricants, Inc.
RP = Royal Purple
RPVOT = Rotating Pressure Vessel Oxidation Test
RTS = Shell Rotella Synthetic HDEO, usually 5w40
SAE = Society of Automotive Engineering
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
T5 = Shell Rotella synthetic blend , available in 10w30 and 10w40
T6 = Shell Rotella full synthetic blend , available 5w40
T-IV: Toyota T-IV, a type of transmission fluid
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
TDT = Mobil 1 Turbo Diesel Truck, a synthetic HDEO 5w40
TFSI = Turbocharged Fuel Stratified Injection
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
VMLNG = Valvoline MaxLife NextGen
VNG = Valvoline NextGen
VOA = Virgin Oil Analysis
VSET = Valvoline Synpower Professional Engine Treatment
VSOT = Valvoline synpower oil treatment 15 oz VSOT (Valvoline Synthetic Oil Treatment)
VSP = Valvoline SynPower
VVT = Variable Valve Timing
VWB = Valvoline White Bottle
WPP = Warren Petroleum Products
WS: Another type of Toyota ATF
XOD = Extended Oil Drain
XOM = Exxon Mobil
YMMV = Your Milage May Vary
ZDDP = Zinc Dialkyl Dithio Phosphate - main use as an anti-wear additive