The 1982 Castrol 400 was an endurance race for touring cars complying with CAMS Group C regulations. The event was held at the Sandown Raceway circuit in Victoria on 12 September 1982 over 109 laps, totalling 337.9 km. The field was divided into four classes according to engine capacity:

• Class A : Up to 1600 cc
• Class B : 1601 - 2000 cc
• Class C : 2001 - 3000 cc
• Class D : 3001 - 6000 cc

There were 52 starters in the event, which was the second round of the 1982 Australian Endurance Championship and the second round of the 1982 Australian Endurance Championship of Makes.

Allan Moffat's win in his Peter Stuyvesant International Mazda RX-7 was the first outright win by a car from a Japanese manufacturer in the annual Sandown endurance race.