Use it if you're supposed to use Premium and you only use the low grade. Use it if you idle the car regularly. Use it if you experience fuel-related symptoms of fuel-starvation. Use it if you're paranoid. Use it if you love spending money for little gain.

Unless you have a good reason, skip it.

__________________
- Brian


1989 500SEL Euro
1966 250SE Cabriolet
1958 BMW Isetta 600