{"id":602,"date":"2026-06-24T10:08:32","date_gmt":"2026-06-24T14:08:32","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1986-chevrolet-blazer-6-2l-8-cyl-diesel-maintenance-guide\/"},"modified":"2026-06-24T10:08:32","modified_gmt":"2026-06-24T14:08:32","slug":"1986-chevrolet-blazer-6-2l-8-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1986-chevrolet-blazer-6-2l-8-cyl-diesel-maintenance-guide\/","title":{"rendered":"1986 Chevrolet Blazer 6.2L Diesel Oil & Maintenance Guide"},"content":{"rendered":"
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\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 1986 Chevrolet Blazer with the 6.2L 8-cylinder Diesel engine (Engine Code C), the oil capacity is 7 quarts when performing a change with a filter. The preferred viscosity for temperatures above -18\u00b0C is SAE 10W-30. AMSOIL recommends using Signature Series 10W-30 100% Synthetic Max-Duty Diesel Oil<\/a> (DTTQT-EA<\/a>) or the Heavy-Duty 100% Synthetic Diesel Oil<\/a> (ADNQT-EA<\/a>) for optimal protection.<\/p>\n

What oil does a 1986 Chevrolet Blazer 6.2L Diesel take?<\/h2>\n

The 1986 Chevrolet Blazer with the 6.2L 8-cylinder diesel engine requires an oil grade of CF-4. Depending on your ambient operating temperatures, different viscosities are recommended to ensure proper lubrication and protection.<\/p>\n

The engine oil capacity is 7 quarts when replacing the filter. It is important to check the oil level after refilling.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the AMSOIL lookup data, here are the recommended fluids and filters for your 1986 Chevrolet Blazer 6.2L Diesel.<\/p>\n

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

Oil Filter Options<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nCode<\/th>\n<\/tr>\n
AMSOIL Oil Filter<\/td>\nEAO24-EA<\/a><\/td>\n<\/tr>\n
WIX Oil Filter<\/td>\n51061-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Coolant & Transmission Fluids<\/h3>\n
\n\n\n\n\n\n\n\n
Component<\/th>\nProduct Name<\/th>\nCode<\/th>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Passenger Car & Light Truck Antifreeze<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Propylene Glycol Antifreeze<\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n
ATF (THM400)<\/td>\nAMSOIL Signature Series Fuel-Efficient ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n
ATF (THM400)<\/td>\nAMSOIL OE Fuel-Efficient ATF<\/td>\nOTLQT-EA<\/a><\/td>\n<\/tr>\n
ATF (THM700-R4)<\/td>\nAMSOIL Signature Series Fuel-Efficient ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Viscosity Guide<\/h3>\n
\n\n\n\n\n\n\n\n
Temperature Range<\/th>\nRecommended Viscosity<\/th>\n<\/tr>\n
Below 16\u00b0C<\/td>\n5W-30<\/td>\n<\/tr>\n
Above -18\u00b0C<\/td>\n10W-30 (Preferred)<\/td>\n<\/tr>\n
Above -12\u00b0C<\/td>\n15W-40<\/td>\n<\/tr>\n
Above -7\u00b0C<\/td>\n20W-20<\/td>\n<\/tr>\n
Above 4\u00b0C<\/td>\n30<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Capacity<\/h3>\n

How much transmission fluid does it take?<\/h2>\n

Capacity varies significantly depending on which automatic transmission is installed in your Blazer. Always verify your specific model before filling.<\/p>\n

Transmission Capacity Details<\/h3>\n
\n\n\n\n\n
Transmission Type<\/th>\nTotal Fill Capacity<\/th>\nInitial Fill Capacity<\/th>\n<\/tr>\n
3-speed THM400<\/td>\n10.6 quarts<\/td>\n4.3 quarts<\/td>\n<\/tr>\n
4-speed THM700-R4<\/td>\n11.5 quarts<\/td>\n5 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Note: For both transmissions, the manufacturer’s technical service bulletin has updated the specification from Dexron II or III to Dexron VI.<\/em><\/p>\n

Coolant Specifications and Capacity<\/h2>\n

Maintaining proper cooling efficiency is vital for diesel longevity. The capacity depends on whether your vehicle is equipped with Air Conditioning (AC).<\/p>\n

\n\n\n\n\n
Configuration<\/th>\nCapacity<\/th>\n<\/tr>\n
With AC<\/td>\n18 quarts<\/td>\n<\/tr>\n
Without AC (O)<\/td>\n17.4 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

Diesel engines face unique stresses such as soot loading and high heat. The following table outlines how specific AMSOIL products can support your maintenance needs.<\/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>\nRequires regular oil changes.<\/td>\n<\/tr>\n
Contaminants<\/td>\nSmall particles can cause abrasive wear.<\/td>\nEAO24-EA<\/a><\/td>\n99% efficiency at 20 microns.<\/td>\nFilter must be replaced per interval.<\/td>\n<\/tr>\n
Extreme Temperatures<\/td>\nViscosity changes can affect lubrication during startup or heavy load.<\/td>\nDHDQT-EA<\/a><\/td>\nExcels in extreme temperatures.<\/td>\nNot a substitute for proper viscosity selection.<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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