Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 760 (MAINTENANCE AND LUBRICATION)SPECIFICATIONSFLUID AND LUBRICANT RECOMMENDATIONS
1999 GMC Forward Control 5.7 R, Automatic
Fluid and Lubricant Recommendations
1999 GMC Forward Control 5.7 R, AutomaticSECTION Fluid and Lubricant Recommendations
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Fluid and Lubricant Recommendations
| Application | Fluid/Lubricant |
|---|---|
| Automatic Transmission | DEXRON®-III Automatic Transmission Fluid |
| Engine Coolant | A 50/50 mixture of clean, drinkable water and use only DEX-COOL® Coolant |
| Engine Oil | The engine requires a special oil meeting GM Specification 4718M. Oils meeting this specification may be identified as synthetic, and should also be identified with the American Petroleum Institute (API) Certified for Gasoline Engines STARBURST symbol. However, not all Synthetic API oils with the STARBURST symbol will meet this GM Specification. Look for and use ONLY an oil that meets GM Specification 4718M. |
| Hinges, Hood and Door | Multi-Purpose Lubricant, Superlube® GM P/N 12346241 (Canadian P/N 10953474) or equivalent |
| Hood Latch Assembly, Secondary Latch, Pivots, Spring Anchor and Release Pawl | Lubriplate® Lubricant Aerosol GM P/N 1234629 (Canadian P/N 992723) or equivalent lubricant meeting requirements of NLGI #2, Category LB or GC-LB |
| Hydraulic Brake System | Delco Supreme 11® Brake Fluid equivalent DOT-3 Brake Fluid |
| Hydraulic Clutch System | Hydraulic Clutch Fluid GM P/N 12345347 (Canadian P/N 10953517) or equivalent DOT-3 Brake Fluid |
| Key Lock Cylinders | Multi-Purpose Lubricant, Superlube® GM P/N 12346241 (Canadian P/N 10953474) or equivalent |
| Manual Transmission | DEXRON®-III Automatic Transmission Fluid |
| Power Steering System | GM Power Steering Fluid GM P/N 1052884 (Canadian P/N 993294) |
| Rear Axle Limited-Slip Differential | SAE 75W-90 Synthetic Axle Lubricant, GM P/N 12378261 (Canadian P/N 10953455) or equivalent meeting GM Specification 9986115. With a complete drain and refill add 118 ml (4 oz) of Limited-Slip Differential Lubricant Additive GM P/N 1052358 (Canadian P/N 992694) or equivalent |
| Weatherstrip Conditioning | Dielectric Silicone Grease GM P/N 12345579 (Canadian P/N 992887) or equivalent |
| Windshield Washer Solvent | GM Optikleen® Washer Solvent or equivalent |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.