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Old 09-16-2005, 06:28 PM
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Mobil 1???
I have been changing my 05 x5 engine oil using mobil 1 5w30 synthetic but BMW recommends using bmw synthetic oil... whats the difference between the two? i know that mobil 1 is a great Synthetic oil.. Also when i bring my car in for 15000 service they will change the oil with bmw synthetic oil.. does it matter using differnt oil?
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Old 09-16-2005, 07:17 PM
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All automotive oils MUST conform to the API (American Petroleum Institute) "Engine Service Classifications" (SA, SB, etc., etc.). API dictates that oils of a specific classification MUST be miscible between brands without deleterious effects. So the answer is that synthetic Mobil 1 5W-30 and synthetic BMW 5W-30 are COMPLETELY miscible/interchangeable.

For what its worth, I personally use Mobil 1 15W-50.
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Old 09-16-2005, 07:19 PM
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Everything you'd ever want to know about motor oil thanks to withidl, one of our very own members here at X5world - http://www.xoutpost.com/articles.php?...icle&artid=208
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Old 09-17-2005, 04:41 AM
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It doesnīt matter to use different oils. But I recommend you to use the mobil1. Itīs the best!
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Old 09-17-2005, 05:04 AM
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I dont believe BMW make their own oils!So,BMW synthetic oils are probably refined by Mobil or Castrol anyway......
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Old 09-17-2005, 12:45 PM
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maybe this can help you. itīs a file from bmw which oil you can use for all bmw
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Old 09-24-2005, 03:05 AM
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hmmm the files shows 0w40??? i just use 5w30 syn.
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