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Below are the AMSOIL oil and filter recommendations for your 1980 Porsche 911 with the 3.0L 6-Cylinder.
1980 PORSCHE 911 3.0L 6-CYLINDER ENGINE CODE 640 C
Your 1980 Porsche 911 rolls on the 3.0L air-cooled flat-six, the engine layout that defined the 911 for its first three and a half decades. Air-cooled Porsches have a character no water-cooled car quite matches, and owners prize them for it. The engine sits behind the rear axle, which is exactly why a 911 handles the way it does, tail-happy and talkative in the hands of a skilled driver.
Air-cooled engines run hot by nature, and heat is the enemy of engine oil. The oil has to protect bearings that see extreme temperatures, especially in summer traffic or on track days. These engines are old now, and most have decades of heat cycles behind them, so the oil you choose matters more than it did when the car was new.
A full synthetic in the recommended grade handles the heat without breaking down and keeps the engine clean inside. For a 1980 911, that is the difference between a 911 that keeps pulling strong and one that slowly gets tired. AMSOIL's European formula lineup was built for engines exactly like this.
The 1980 Porsche 911 3.0L 6-Cylinder requires 10W-40 full synthetic motor oil. Capacity is 9.9 quarts including filter.
Here is what you need:
You need 9.9 quarts of AMSOIL Premium Protection 10W-40 100% Synthetic Motor Oil AMOQT-EA which you can learn more about here: AMSOIL synthetic motor oil 10W-40
You need the MANN-FILTERS oil filter for your 911 which is: W94029
Drain Plug Torque Spec: 51 ft/lbs - always replace the drain plug seal when changing oil.
To learn how to get wholesale dealer pricing go to: Where can I buy AMSOIL.
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