{"id":633,"date":"2026-06-26T08:26:27","date_gmt":"2026-06-26T12:26:27","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1981-peugeot-504-2-3l-4-cyl-diesel-maintenance-guide\/"},"modified":"2026-06-26T08:26:27","modified_gmt":"2026-06-26T12:26:27","slug":"1981-peugeot-504-2-3l-4-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1981-peugeot-504-2-3l-4-cyl-diesel-maintenance-guide\/","title":{"rendered":"1981 Peugeot 504 2.3L Diesel Maintenance Guide: Oil & Fluid Specifications"},"content":{"rendered":"
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\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 1981 Peugeot 504 with the 2.3L 4-cylinder XD2C 3 Diesel engine, the oil capacity is 5.3 quarts<\/strong> (including filter replacement). The recommended oil viscosity for all temperatures is 10W-40<\/strong>, or 15W-40<\/strong> for temperatures above -10\u00b0C. AMSOIL recommends Signature Series 5W-40 100% Synthetic Max-Duty Diesel Oil<\/a> (DEOQT-EA<\/a>) for superior wear protection and efficiency.<\/p>\n

What oil does a 1981 Peugeot 504 2.3L Diesel take?<\/h2>\n

The 1981 Peugeot 504 with the XD2C engine requires an oil grade of CF. For optimal performance across various climates, use a 10W-40 viscosity for all temperatures. If operating in environments where temperatures stay above -10\u00b0C, a 15W-40 viscosity is also appropriate.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the specific requirements for the 1981 Peugeot 504 2.3L Diesel, AMSOIL provides several high-performance lubrication options to maintain engine and drivetrain health.<\/p>\n

Engine Oil Recommendations<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nViscosity<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL Signature Series Max-Duty Diesel Oil<\/td>\n5W-40<\/a><\/td>\nDEOQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL Heavy-Duty 100% Synthetic Diesel Oil<\/td>\n5W-40<\/a><\/td>\nADOQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Transmission & Differential Recommendations<\/h3>\n
\n\n\n\n\n\n\n\n
Component<\/th>\nProduct Name<\/th>\nPart Code<\/th>\n<\/tr>\n
Automatic Transmission<\/td>\nSignature Series Multi-Vehicle ATF<\/td>\nATFPK-EA<\/a><\/td>\n<\/tr>\n
Automatic Transmission<\/td>\nOE Multi-Vehicle ATF<\/td>\nOTFQT-EA<\/a><\/td>\n<\/tr>\n
Manual Transmission<\/td>\nPremium Protection 10W-40<\/a><\/td>\nAMOQT-EA<\/a><\/td>\n<\/tr>\n
Manual Transmission<\/td>\nExtended-Life 10W-40<\/a><\/td>\nXLOQT-EA<\/a><\/td>\n<\/tr>\n
Rear Differential<\/td>\nSevere Gear 80W-90<\/a><\/td>\nAGLPK-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Coolant & Brake Fluid<\/h3>\n
\n\n\n\n\n\n
Component<\/th>\nProduct Name<\/th>\nPart Code<\/th>\n<\/tr>\n
Engine Coolant<\/td>\nPassenger Car & Light Truck Antifreeze<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
Engine Coolant<\/td>\nPropylene Glycol Antifreeze<\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n
Clutch\/Brake Fluid<\/td>\nDOT 3 and DOT 4 Synthetic Brake Fluid<\/td>\nBFLVCN-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Specifications<\/h3>\n
\n\n\n\n\n\n
Specification<\/th>\nDetail<\/th>\n<\/tr>\n
Oil Grade<\/td>\nCF<\/td>\n<\/tr>\n
Viscosity (All Temps)<\/td>\n10W-40<\/td>\n<\/tr>\n
Viscosity (Above -10\u00b0C)<\/td>\n15W-40<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Capacity<\/h3>\n
\n\n\n\n
Condition<\/th>\nCapacity<\/th>\n<\/tr>\n
With Filter Change<\/td>\n5.3 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Note: Always check the oil level after refilling.<\/em><\/p>\n

Manual and Automatic Transmission Specifications<\/h2>\n

The transmission requirements vary significantly depending on whether your Peugeot 504 is equipped with a manual or automatic gearbox.<\/p>\n

Automatic Transmission (3HP-22)<\/h3>\n
\n\n\n\n\n
Measurement<\/th>\nCapacity<\/th>\n<\/tr>\n
Total Fill<\/td>\n5.5 quarts<\/td>\n<\/tr>\n
Initial Fill<\/td>\n1.7 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

The AMSOIL lookup note references the 3HP-22 transmission for this application.<\/p>\n

Manual Transmission (U\/K)<\/h3>\n
\n\n\n\n\n
Specification<\/th>\nDetail<\/th>\n<\/tr>\n
Viscosity<\/td>\n10W-40 (All TEMPS)<\/td>\n<\/tr>\n
Capacity<\/td>\n2.5 pints<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Differential and Clutch Fluid Details<\/h2>\n

Proper lubrication of the rear differential is critical for maintaining the drivetrain components of this classic Peugeot.<\/p>\n

Rear Differential<\/h3>\n
\n\n\n\n\n
Specification<\/th>\nDetail<\/th>\n<\/tr>\n
Viscosity\/Grade<\/td>\nGL-5, 80W-90 or 80W (All TEMPS)<\/td>\n<\/tr>\n
Capacity<\/td>\n3.4 pints<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Clutch\/Brake Fluid<\/h3>\n

For the clutch system, the vehicle requires Hydraulic Brake Fluid, DOT 4 (Recommended for: HBH).<\/p>\n

Common diesel oil-related concerns and how AMSOIL products may help<\/h2>\n
\n\n\n\n\n\n
Concern<\/th>\nWhy it matters<\/th>\nAMSOIL product<\/th>\nHow it may help<\/th>\nLimitation<\/th>\n<\/tr>\n
Engine Wear<\/td>\nDiesel engines face high pressure and friction.<\/td>\nDEOQT-EA<\/a><\/td>\nDelivers up to 6X more wear protection.<\/td>\nRequires regular monitoring.<\/td>\n<\/tr>\n
Extreme Temperatures<\/td>\nViscosity changes can affect lubrication.<\/td>\nADOQT-EA<\/a><\/td>\nExcels in extreme temperatures.<\/td>\nNot confirmed for all specific climates.<\/td>\n<\/tr>\n
Differential Wear<\/td>\nHigh torque can cause gear degradation.<\/td>\nAGLPK-EA<\/a><\/td>\nProvides advanced protection against wear.<\/td>\nDiagnosis may be required for existing damage.<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Diesel maintenance notes for this vehicle<\/h2>\n