{"id":553,"date":"2026-06-20T12:37:29","date_gmt":"2026-06-20T16:37:29","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1982-isuzu-i-mark-1-8l-4-cyl-diesel-maintenance-guide\/"},"modified":"2026-06-20T12:37:29","modified_gmt":"2026-06-20T16:37:29","slug":"1982-isuzu-i-mark-1-8l-4-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1982-isuzu-i-mark-1-8l-4-cyl-diesel-maintenance-guide\/","title":{"rendered":"1982 Isuzu I-Mark 1.8L Diesel Maintenance Guide: Oil & Filter Specs"},"content":{"rendered":"
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\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 1982 Isuzu I-Mark equipped with the 1.8L 4-cylinder diesel engine (Engine Code [P] P), the oil capacity is 5.5 quarts with a filter change. Recommended viscosities include 10W-30 for temperatures below 30\u00b0C, and 15W-40, 20W-40, or 20W-50 for temperatures above -14\u00b0C. AMSOIL recommends Signature Series 15W-40 100% Synthetic Max-Duty Diesel Oil<\/a> (DMEQT-EA<\/a>) or Heavy-Duty 100% Synthetic Diesel Oil<\/a> (ADPQT-EA<\/a>) paired with a WIX Oil Filter<\/a> (51324-EA<\/a>).<\/p>\n

What oil does a 1982 Isuzu I-Mark 1.8L Diesel take?<\/h2>\n

The engine requires an oil grade of CF. The specific viscosity depends on your operating temperature: use 10W-30 for temperatures below 30\u00b0C, or options like 15W-40, 20W-40, and 20W-50 for environments above -14\u00b0C. Note that SAE 5W-30 is not recommended for sustained high-speed driving.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the Isuzu I-Mark 1.8L Diesel specifications, the following AMSOIL products are recommended for optimal engine and component protection.<\/p>\n

Engine Oil Recommendations<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL Signature Series 15W-40 100% Synthetic Max-Duty Diesel Oil<\/td>\nDMEQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL 15W-40 Heavy-Duty 100% Synthetic Diesel Oil<\/td>\nADPQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Filter & Coolant Recommendations<\/h3>\n
\n\n\n\n\n\n
Component<\/th>\nProduct \/ Code<\/th>\n<\/tr>\n
Oil Filter<\/td>\nWIX 51324-EA<\/a><\/td>\n<\/tr>\n
Antifreeze (Pre-mix)<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
Antifreeze (Concentrate)<\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Transmission Fluid Recommendations<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL Signature Series Multi-Vehicle 100% Synthetic ATF<\/td>\nATFPK-EA<\/a><\/td>\n<\/tr>\n
AMSOIL OE Multi-Vehicle 100% Synthetic ATF<\/td>\nOTFQT-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 30\u00b0C<\/td>\n10W-30<\/td>\n<\/tr>\n
Above -14\u00b0C<\/td>\n15W-40, 20W-40, 20W-50<\/td>\n<\/tr>\n
Below -14\u00b0C<\/td>\n5W-30 (Not for high-speed)<\/td>\n<\/tr>\n
Above 0\u00b0C<\/td>\n30<\/td>\n<\/tr>\n
Above 24\u00b0C<\/td>\n40<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Capacity<\/h3>\n

The total capacity is 5.5 quarts when replacing the filter. Always check the oil level after refilling.<\/p>\n

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

For automatic transmissions, capacities vary by model code. For the 03-55 transmission, the total fill is 6.3 quarts with a 2.1 quart initial fill. For the 03-56 transmission, the total fill is also 6.3 quarts with a 2.1 quart initial fill.<\/p>\n

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

Maintaining an older diesel engine like the Isuzu ‘P P’ series requires attention to specific mechanical areas:<\/p>\n