Hi guys,
I just want to pop in and clarify the oil recommended for the NAFTA Fiat 500.
The US cars use MultiAir, and the specified oil weight is 5W30. And unlike European cars, synthetic oil is not required on North American Fiat 500s. That information was told to me directly by the head engineer responsible for adapting the MultiAir engine into the North American Fiat 500. It is also in the owners manual:
Engine Oil –1.4L Engine
We recommend you use API Certified SAE 5W-30 Engine Oil, meeting the requirements of FCA Material Standard MS-6395. Refer to your engine oil filler cap for correct SAE grade.
Synthetic Engine Oils
You may use synthetic engine oils provided the recommended oil quality requirements are met, and the recommended maintenance intervals for oil and filter changes are followed. 7 Synthetic engine oils which do not have both the engine oil certification mark and the correct SAE viscosity grade number should not be used.
You do not have to change the oil weight due to the weather:
Engine Oil Viscosity (SAE Grade) — 1.4L Engine
SAE 5W-30 engine oil approved to FCA Material Standard MS-6395 such as Pennzoil, Shell Helix or equivalent is recommended for all operating temperatures. This engine oil improves low temperature starting and vehicle fuel economy.
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The North American Fiat 500 Abarth is equipped with the MultiAir Turbo, similar to the Alfa MiTo and Abarth Punto EVO. That engine was adapted for use in North America and the oil requirements are 5W40 SYNTHETIC.
An interesting note is there were changes made in North American engines to use these oils. In particular, changes to the piston rings, piston crown, and some of the bearings.
Best regards,
Chris