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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 02-04-2011, 06:10 AM
bluebee's Avatar
bluebee bluebee is offline
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Location: San Jose, California
 
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Mein Auto: 02 BMW 525i M54 automatic
What are the dogmatic gasoline "camps" we all fit into when it comes to our BMW E39

In a recent thread today, the typical age-old top-tier vs gas-is-gas discussion ensued:
- Shell v-power, by DominguesE30, in Australia

Some of this discussion is influenced by marketing efforts (i.e., "the big lie"), while others are influenced by knowledge of college-level inorganic and organic chemistry (most of us have probably taken both, including myself).

Predictably, just as in the motor oil & coolant camps, there appear to be a small number of differences of educated opinion on the age-old question of "which gasoline should I put in my BMW E39" which account for almost all the back-and-forth discussion.

It was harder to describe the religious camps for gasoline than it was for motor oil or for coolant, so, as is my habit, here is only my first stab at defining the dogmatic doctrines that already exist for what gas to use in a BMW E39 - we can correct the description as we move forward.

Is this a reasonable listing of the key camps we all fit into?
  1. Use only BMW-recommended "top-tier" gasolines with the recommended additive level & octane rating (it's on a list, or it's not)
  2. Use any gasoline of only the recommended octane rating or higher
  3. Use any gasoline of any common octane rating (i.e., 87AKI, 89AKI, & 92AKI in the USA)
What would you modify to better describe "our" gasoline selection decisions for the E39?
  1. Gas is gas only if it's top-tier gas!
  2. Gas is gas but octane is important
  3. Gas is gas and octane is overrated
Note: See also the VERY best of E39 Links threads:
- Engine fuel, i.e., gasoline & octane (1) & "The Gasoline FAQ" & top-tier gas stations (1)

Last edited by bluebee; 02-06-2011 at 08:11 AM.
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