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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 03-22-2005, 09:19 PM   #1 (permalink)
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Full synthetic oil:
===========
>>Pros: premium performance at low and high temps, clean engine, no build up
of residu because of impurities of the oil. Due to purity of synt.oil it
can cope with longer intervals between oil changes. Less oil breakdown.
The engine may or may not leak due to the removal of residu from previous
Dino oils, and thus making room for more leaks, especially seals and
gaskets. It is recommended to stay with same brand in order to avoid
different additives and solvents that have negative effects on seals and
o-rings. So if your seals are in top condition, you're ok. With bad seals
the crud may just prevent more leakage, and cleaning out will increase the
leaking. The older Mobil-1 0w15 is known to un-swell the seals causing leaks,
but the engineers fixed this by altering the additive package some time ago.
>>Cons: you may reconsider using Synth. when already experiencing leaks and
want to avoid the chance of more leaking. You can still switch back to
Dino without big problems but this will not reverse the leaks. Try to stay
within one brand to avoid other solvents working on the seals. This is one
of the reasons that full.Synth gets blamed for leaks. The full Synth is
the most expensive choice.


So the advice: Use a good Synthetic oil (Mobil 1 ?) when the engine seals are in good condition and money is not an issue. Always use oils from the same brand in the engine regardless of Synthetic or Dino.
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Old 03-24-2005, 05:56 AM   #2 (permalink)
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Ok this topic has been beat to death over the last 20 years. Bottom line is use the same oil your car left the factory with and always change your oil at least evry 6 months or 5,000 miles no matter what oil you are using. There is no proof that using Sync oil improves anything vs conventional oil. The only advantage to sync vs conventional is that it will not break down at higher temp. So if your engine does not operate above 300 degrees F you have nothing to worry abought. Later
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Old 03-24-2005, 03:20 PM   #3 (permalink)
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What Brand of Oil do you start with?
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Old 03-24-2005, 09:20 PM   #4 (permalink)
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Quote:
Originally posted by 2000BMW323i@Mar 24 2005, 05:20 PM
What Brand of Oil do you start with?
[snapback]317809[/snapback]
I believe it is Castrol..........
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Old 03-25-2005, 12:59 PM   #5 (permalink)
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Quote:
Originally posted by Aloyouis+Mar 24 2005, 10:20 PM--><div class='quotetop'>QUOTE(Aloyouis @ Mar 24 2005, 10:20 PM)</div><div class='quotemain'><!--QuoteBegin-2000BMW323i@Mar 24 2005, 05:20 PM
What Brand of Oil do you start with?
[snapback]317809[/snapback]
I believe it is Castrol..........
[snapback]318025[/snapback]
[/b][/quote]

Yeah ! it is Castrol Softec LL01 5W/30 (EU made)
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