{"id":523,"date":"2026-06-18T05:09:33","date_gmt":"2026-06-18T09:09:33","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1984-gmc-s15-pickup-2-2l-4-cyl-diesel-maintenance-guide\/"},"modified":"2026-06-18T05:09:33","modified_gmt":"2026-06-18T09:09:33","slug":"1984-gmc-s15-pickup-2-2l-4-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1984-gmc-s15-pickup-2-2l-4-cyl-diesel-maintenance-guide\/","title":{"rendered":"1984 GMC S15 Pickup 2.2L Diesel Maintenance Guide: Oil & Fluid Specs"},"content":{"rendered":"
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\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 1984 GMC S15 Pickup with the 2.2L 4-cylinder diesel engine (Engine Code S), the oil capacity is 6 quarts with a filter change. Recommended viscosities include SAE 10W-30 for temperatures below 38\u00b0C, 15W-40 for temperatures above -12\u00b0C, and 30 weight for temperatures above 0\u00b0C. AMSOIL recommends Signature Series 10W-30 100% Synthetic Max-Duty Diesel Oil<\/a> (DTTQT-EA<\/a>) for outstanding extreme-pressure protection.<\/p>\n

What oil does a 1984 GMC S15 Pickup 2.2L Diesel take?<\/h2>\n

The engine requires an oil with a CF grade specification. Depending on your operating environment, you should select the appropriate viscosity: SAE 10W-30 is preferred for temperatures below 38\u00b0C, while 15W-40 is suitable for temperatures above -12\u00b0C. For environments consistently above 0\u00b0C, a 30 weight oil may be used.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the AMSOIL lookup data, here are the recommended fluids for your 1984 GMC S15 Diesel. Always verify compatibility with your specific vehicle configuration.<\/p>\n

Engine Oil Recommendations<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL Signature Series 10W-30 100% Synthetic Max-Duty Diesel Oil<\/td>\nDTTQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL 10W-30 Heavy-Duty 100% Synthetic Diesel Oil<\/td>\nADNQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL Signature Series 5W-30 100% Synthetic Max-Duty Diesel Oil<\/td>\nDHDQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Coolant & Antifreeze Recommendations<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL Passenger Car & Light Truck Antifreeze & Coolant<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
AMSOIL Propylene Glycol Antifreeze and Engine Coolant<\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Automatic Transmission Fluid Recommendations<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL Signature Series Fuel-Efficient 100% Synthetic ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n
AMSOIL OE Fuel-Efficient 100% Synthetic ATF<\/td>\nOTLQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Specifications<\/h3>\n
\n\n\n\n
Parameter<\/th>\nSpecification\/Value<\/th>\n<\/tr>\n
Oil Grade<\/td>\nCF<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Viscosity Guide<\/h3>\n
\n\n\n\n\n\n
Temperature Range<\/th>\nRecommended Viscosity<\/th>\n<\/tr>\n
Below 38\u00b0C<\/td>\n10W-30 (Preferred)<\/td>\n<\/tr>\n
Above -12\u00b0C<\/td>\n15W-40<\/td>\n<\/tr>\n
Above 0\u00b0C<\/td>\n30<\/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>\n6 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

Automatic Transmission Fluid Specifications<\/h2>\n

The transmission requirements vary by model. For the THM700-R4, the manufacturer’s Technical Service Bulletin has updated the specification from Dexron II or III to Dexron VI. For the THM200C, the AF6 specification is noted.<\/p>\n

THM700-R4 (4-Speed) Specifications<\/h3>\n
\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n
Total Fill Capacity<\/td>\n11.2 quarts<\/td>\n<\/tr>\n
Initial Fill Capacity<\/td>\n5 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

THM200C (3-Speed) Specifications<\/h3>\n
\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n
Total Fill Capacity<\/td>\n9.4 quarts<\/td>\n<\/tr>\n
Initial Fill Capacity<\/td>\n3 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Coolant Specifications<\/h2>\n

The cooling system capacity depends on the specific configuration of your vehicle.<\/p>\n

\n\n\n\n\n
Configuration<\/th>\nCapacity<\/th>\n<\/tr>\n
With O AC<\/td>\n11.6 quarts<\/td>\n<\/tr>\n
With AC<\/td>\n12.2 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

Maintenance for this era of diesel engine should prioritize fuel system integrity and cooling efficiency. Because these engines require strict adherence to fuel filtration standards, regular inspection is necessary to prevent injector issues. Given the age of a 1984 model, owners should also inspect all rubber components, belts, and hoses for signs of degradation.<\/p>\n

Common diesel oil-related concerns and how AMSOIL products may help<\/h2>\n

Maintaining older diesel engines requires addressing specific operational challenges. The following table outlines common concerns and how AMSOIL products listed in this lookup can support engine health.<\/p>\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 combustion creates high pressure and friction.<\/td>\nDTTQT-EA<\/a><\/td>\nDelivers up to 6X more wear protection.<\/td>\nDoes not repair existing damage.<\/td>\n<\/tr>\n
Extreme Temperatures<\/td>\nViscosity changes can affect lubrication during start-up or high heat.<\/td>\nDHDQT-EA<\/a><\/td>\nExcels in extreme temperatures and maintains proper viscosity.<\/td>\nRequires correct selection for ambient temp.<\/td>\n<\/tr>\n
Oil Consumption<\/td>\nOlder engines may consume more oil during operation.<\/td>\nADNQT-EA<\/a><\/td>\nDesigned to minimize oil consumption.<\/td>\nDoes not fix mechanical leaks.<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Common maintenance concerns for this vehicle<\/h2>\n