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For the 2003 Nissan Frontier, it's recommended to use SAE 75w-90 full synthetic API GL-5 hypoid gear oil in the rear differential. The differential fluid is crucial for keeping the gears, bearings, and internal components properly lubricated and cooled. Over time, the effectiveness of the differential gear oil diminishes, so it should be replaced to protect the differential assembly. Continuing to drive with old oil can lead to damage, costing more than $1200 in repairs. To prevent extensive damage and save money, it is advised to change the differential fluid every 30,000 to 60,000 miles.
The 2003 3.3L supercharged Nissan Frontier requires 80-90 GL-5 oil, according to the manual. Additionally, all supercharged Frontiers come equipped with limited slip differentials.
For the 2003 Nissan Frontier, it is best to use SAE 75W-90 full synthetic API GL-5 hypoid gear oil in the rear differential.