1988 Dodge Diplomat OilsR.Us - Only the Best!

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AMSOIL manufacture's the world's best synthetic lubricant's & filters since 1972. AMSOIL also offers substitute brands such as WIX, Mann & Donaldson making us your one-stop shop for all automotive maintenance needs.

How do I use this Product Cross Reference Guide?

Product Cross Reference Guide: This product cross reference guide follows recommendations outlined in your owners manual and also reflects periodic service recommendation updates from the original equipment manufacturer for this particular model (1988 Dodge Diplomat with engine code [4]) show example...

For example, the manufacturer may have recommended 5W30 motor oil at the time of production (owners manual) & later revised the recommendation to 5W20. This guide will reflect latest recommendation by the manufacturer for this model. If there are no special instructions from the manufacturer, the owner can choose to follow either one of the recommendation without voiding warranty hide example.

Optional Equipment Listing This guide lists all available equipment options such as transmission options, differentials etc. for 1988 Dodge Diplomat with engine code [4] hide.
Product Availability Listing This guide lists all available AMSOIL & substitute brand products that meet or exceed OEM (Dodge) recommendation for each equipment. Any one of the recommended product can be used. One may be better than the other, you can review product details & price or contact us to ask our opinion pertaining to your usage and preference hide.
Operating Temperature Original equipment manufacturer (OEM) sometimes provide different product recommendations based on operating environment temperature for a given equipment. This product cross reference guide will list such recommendations based on OEM guidelines. Some OEM recommended viscosity pertaining to a specific temperature range may not be available from AMSOIL.

However, AMSOIL products recommended for another temperature range can be safely used because AMSOIL synthetic lubricants are engineered to provide exceptional performance for significantly broader temperature range when compared to conventional & or other brand synthetic oils. For more information on a lubricants cold temperature performance; please refer to "Pour Point" from "Technical Properties" table located at the bottom of each lubricant product page hide.
Last Updated This product cross reference guide for 1988 Dodge Diplomat engine code [4] was last updated on 5th July 2018 hide.

     

1. Engine Oil

   Grade 1  »  SJ
   10W-30 Synthetic Small Engine Oil (ASEQT)
   Above 10 F  »  15W-40
   Above 0 F  »  10W-30
   Above 19 F  »  30
   All TEMPS  »  40, 30, 20W-40, 20W-50 [1]
   

2. Automatic Transmission

   Automatic Transmission, A727(36RH)  »  AP4

   Signature Series Multi-Vehicle Synthetic Automatic Transmission Fluid (ATF) (ATFQT)
   OE Multi-Vehicle Synthetic Automatic Transmission Fluid (OTFQT)
   

3. Rear Differential

   Standard Differential, Rear W/ 7.25 RG 9bc  »  GL-5

   Below -29 F  »  75W
   

   No AMSOIL Product Recommendation

   ---

   Standard Differential, Rear  »  GL-5

   -29 To -9 F  »  80W-90, 85W-90, 80W
   SAE 80W-90 Synthetic Gear Lube (AGLQT)
   Severe Gear® 75W-90 (SVGQT)
   Severe Gear® 75W-110 (SVTQT)
   

   ---

   Standard Differential, Rear  »  GL-5

   Above -9 F  »  80W-90, 90, 85W-90
   SAE 80W-90 Synthetic Gear Lube (AGLQT)
   Severe Gear® 75W-90 (SVGQT)
   Severe Gear® 75W-110 (SVTQT)
   

   ---

   Standard Differential, Rear  »  GL-5

   Below -29 F  »  75W
   

   No AMSOIL Product Recommendation

   ---

   Standard Differential, Rear W/ 7.25 RG 10bc  »  GL-5

   Below -29 F  »  75W
   

   No AMSOIL Product Recommendation

   ---

   Limited Slip Differential, Rear W/ 7.25 RG 9bc  »  GL-5*

   All TEMPS  »  90 [2]
   SAE 80W-90 Synthetic Gear Lube (AGLQT)
   Severe Gear® 75W-90 (SVGQT)
   Severe Gear® 75W-110 (SVTQT)
   

   ---

   Limited Slip Differential, Rear  »  GL-5*

   All TEMPS  »  90 [2]
   SAE 80W-90 Synthetic Gear Lube (AGLQT)
   Severe Gear® 75W-90 (SVGQT)
   Severe Gear® 75W-110 (SVTQT)
   

   ---

   Standard Differential, Rear W/ 7.25 RG 9bc  »  GL-5

   Above -9 F  »  80W-90, 90, 85W-90
   SAE 80W-90 Synthetic Gear Lube (AGLQT)
   Severe Gear® 75W-90 (SVGQT)
   Severe Gear® 75W-110 (SVTQT)
   

   ---

   Standard Differential, Rear W/ 7.25 RG 10bc  »  GL-5

   Above -9 F  »  80W-90, 90, 85W-90
   SAE 80W-90 Synthetic Gear Lube (AGLQT)
   Severe Gear® 75W-90 (SVGQT)
   Severe Gear® 75W-110 (SVTQT)
   

   ---

   Limited Slip Differential, Rear W/ 7.25 RG 10bc  »  GL-5*

   All TEMPS  »  90 [2]
   SAE 80W-90 Synthetic Gear Lube (AGLQT)
   Severe Gear® 75W-90 (SVGQT)
   Severe Gear® 75W-110 (SVTQT)
   

   ---

   Standard Differential, Rear W/ 7.25 RG 10bc  »  GL-5

   -29 To -9 F  »  80W-90, 85W-90, 80W
   SAE 80W-90 Synthetic Gear Lube (AGLQT)
   Severe Gear® 75W-90 (SVGQT)
   Severe Gear® 75W-110 (SVTQT)
   

   ---

   Standard Differential, Rear W/ 7.25 RG 9bc  »  GL-5

   -29 To -9 F  »  80W-90, 85W-90, 80W
   SAE 80W-90 Synthetic Gear Lube (AGLQT)
   Severe Gear® 75W-90 (SVGQT)
   Severe Gear® 75W-110 (SVTQT)
   

4. Power Steering Fluid

   Power Steering Fluid  »  PS009

   Power Steering Fluid (PSFCN)
   

5. Brake Fluid

   Brake Fluid  »  HB

   DOT 3 and 4 Brake Fluid (BFLVCN) [3]
   

6. Lubricants & Fluids Comments  »  [*]

   [1] Engines used for maximum performance (providing cold
   starting is satisfactory).
   [2] Add 4 oz of Mopar limited-slip additive (MS-10111).
   [3] Hydraulic Brake Fluid, DOT 3 P/N 04318080AC, meeting MS-4574
   
   

7. Fluid Capacities (drive train fluids)

   Engine, with filter  »  5 quarts [1]
   Cooling System, With AC Initial Fill  »  16.4 quarts
   Passenger Car & Light Truck Antifreeze & Coolant
   AMSOIL Antifreeze and Engine Coolant
   Cooling System, Without AC Initial Fill  »  15.3 quarts
   Passenger Car & Light Truck Antifreeze & Coolant
   AMSOIL Antifreeze and Engine Coolant
   Automatic Transmission, A727(36RH) Initial Fill  »  4 quarts
   Automatic Transmission, Total Fill
   3 speed A727(36RH)  »  8.3 quarts
   Differential, Rear  »  4.4 pints
   Differential, With 7.25 RingGear 10bc Rear  »  2.5 pints
   Differential, With 7.25 RingGear 9bc Rear  »  2.1 pints
   ANTPC ANT ANTPC ANT
   Capacities Comments
   [1] After refill check oil level.
   

8. Chassis Lubrication

   9-10 Fittings, 0 Plugs  »  LB
   Synthetic Multi-Purpose Grease NLGI #2 (GLC3P)
   Synthetic Water Resistant Grease (GWR3P)
   DOMINATOR® Synthetic Racing Grease (GRGCR)
   

9. Torque Specifications

   Oil Drain Plug  »  20 ft/lbs
   

Close Panels

1. Filters: Oil, Air, Cabin, Fuel, Transmission, Hydraulic & Crankcase

   Oil Filter	25, 000-Mile Ea Oil Filter (EAO42)
   Oil Filter	MANN Oil Filter (W92017)
   Oil Filter	WIX 51068 Oil Filter
   Air Filter	WIX 42020 Air Filter
   Fuel Filter	WIX 33095 Fuel Filter	[1]
   Fuel Filter	WIX 33054 Fuel Filter	[2]
   Transmission Filter	WIX 58707 Trans Filter
   Oil Vapor Filter	WIX 42997 Crankcase Filter

   
   Filter Comments
   [1] Without Vapor Diverter
   [2] With Vapor Diverter
   

2. Gasoline Engine Fuel Additives

   Dominator Octane Boost (AOB)

   Dominator Octane Boost (AOB)
   
   Maximizes power and improves performance in all two-cycle and four-cycle gasoline engines. Reduces engine knock, improves ignition and engine response, helps fuel burn cleaner and inhibits corrosion. Recommended for off-road and racing use. Packag...

   
   Gasoline Stabilizer (AST)

   Gasoline Stabilizer (AST)
   
   AMSOIL Gasoline Stabilizer (AST) reduces the oxidation process that occurs when fuel is stored for extended periods, improving performance, extending equipment life and decreasing maintenance expenses. Package sizes include: 16-oz. Bottle ...

   
   P.I Performance Improver (API)

   P.I Performance Improver (API)
   
   P.i. improves fuel mileage an average of 2.3% and up to 5.7%. Reduces emissions such as hydrocarbons (HC) up to 15%, carbon monoxide (CO) up to 26% and nitrous oxides (NOx) up to 17%. Restores power and performance. Reduces the need for costly higher...

   
   

Close Panels

10W-30 Synthetic Small Engine Oil (ASE)

Formulated to outperform passenger-car/light-truck oils, AMSOIL Synthetic Small-Engine Oil protects against wear, deposits and oil consumption in over-worked, under-maintained small engines professionals rely on to make a living. Package sizes inc...

Signature Series Multi-Vehicle Synthetic ATF

AMSOIL Signature Series Multi-Vehicle Synthetic ATF is engineered to outperform conventional automatic transmission fluids and exceed the performance requirements of most North American, European and Asian vehicles. This sophisticated formulation pro...

OE Multi-Vehicle Synthetic ATF

AMSOIL OE Synthetic Automatic Transmission Fluid provides passenger-car/light-truck transmissions excellent wear protection, sludge resistance and extreme-temperature performance throughout original equipment manufacturer (OEM)-recommended drain inte...

SEVERE GEAR 80W-90 (AGL)

A multi-functional lubricant designed to surpass the requirements of equipment and automotive applications calling for an SAE 80W-90 viscosity grade. Formulated with wax-free synthetic base oils and high-quality additives, AMSOIL SEVERE GEAR® res...

75W 90 Severe Gear® Extreme Pressure (SVG)

Formulated for the severe operating conditions of today’s pick-up trucks, SUVs, heavy equipment and other hard-working vehicles. AMSOIL SEVERE GEAR® Synthetic Extreme Pressure (EP) Lubricants are premium grade gear oils specifically engi...

75W-110 Severe Gear® Extreme Pressure (SVT)

AMSOIL SEVERE GEAR® Synthetic Extreme Pressure (EP) Lubricants are engineered for high-demand applications, including trailer towing, heavy hauling, 4X4 off-road driving, commercial use and racing. Protects gears and bearings from scoring and wea...

DOT 3 and 4 Synthetic Brake Fluid (BFLV)

*** This item is available for US customers only *** Brake fluid acts as a hydraulic fluid, transferring power and lubricating brake system components while also preventing corrosion. It must contend with extreme heat and the inevitable moi...

Multi-Vehicle Synthetic Power Steering Fluid (PSF)

AMSOIL Multi-Vehicle Synthetic Power Steering Fluid provides excellent wear protection. Its synthetic formulation delivers better lubricity and reduced friction, resulting in cooler operating temperatures, longer component life and quieter operation....

Synthetic Multi-Purpose Grease NLGI #2 (GLC)

AMSOIL Synthetic Multi-Purpose Grease is qualified against the highest grease standards and designed for multiple-use applications. Composed of premium-quality synthetic base oils and calcium sulfonate complex thickeners, Multi-Purpose Grease provide...

Synthetic Water Resistant Grease NLGI#2 (GWR)

Superior Lubrication and Protection in Automotive and Industrial Applications With Extensive Exposure to Water Package sizes include: 3-oz. Cartridges (not sold individually, comes in a pack of 3) 3-oz. Cartridges (case of 10) 14-oz. Cartri...

DOMINATOR Synthetic Racing Grease (GRG)

Exceptional High-Speed/High-Temperature Performance. AMSOIL DOMINATOR® Synthetic Racing Grease is engineered to protect high-performance bearings and chassis components in racing applications operated on snow, dirt, water or track. Package siz...

Passenger Vehicle Antifreeze (ANTPC)

Ethylene Glycol 50/50 Pre-Mix Formulation AMSOIL Passenger Car/Light Truck Antifreeze & Coolant provides superior heat transfer and excellent protection against corrosion, freezing and boilover. It provides maximum protection in extreme temper...

Antifreeze and Engine Coolant (ANT)

AMSOIL Antifreeze & Coolant (ANT) is a low-toxicity propylene glycol antifreeze formulated to provide benefits far beyond those found in today's conventional antifreeze and coolant products. This revolutionary formulation provides maximum antifre...

AMSOIL Ea Oil Filters

AMSOIL Ea Oil Filters feature synthetic nanofiber technology for maximum efficiency. Guaranteed for up to 15,000 miles or up to 25,000 miles, depending on application, when used with AMSOIL synthetic motor oil.

MANN-FILTERS Oil Filters

Oil filters from MANN-FILTER purify oil of dirt and solid particles such as dust, abraded metal, carbon deposits and soot particles. The filter housing is pressure-resistant, protected against corrosion and features a long-life elastomer seal. Use Part Number drop down to select filter.

WIX Automotive, Light Truck & Racing Oil Filters

WIX Oil filters are made with full metal base plate for superior strength at the double seal & also feature a silicone anti-drainback valve. Glass enhanced media in WIX oil filters offers greater efficiency, capturing more 10 to 12 micron sized particles than other cellulose or synthetic blend medias.

WIX Automotive & Light Truck Transmission Filters

WIX Transmission Filters protect automatic transmissions against contaminants in the transmission fluid system. Proper filtration helps improve transmission life by minimizing wear and preventing sticking and scoring of sensitive shift control valves.