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Best Fuel for new 4.6 L Northstar V-8 engine


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I just bought a Buick Lucerne that has a 4.6L Northstar V-8 and I was wondering what grade of fuel would be best for it. This is to seek maximum fuel economy, performance and engine life. I want to keep this vehicle for several years so I want to use fuel that will help with overall longevity.

Also, what engine oil would be best for long term operation and economy.

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