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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 03-06-2012, 10:48 AM   #1 (permalink)
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what is the difference

between the 256s4 and the 256s5 engine.. was the 256s5 built for the facelift 3 series from 2002. and would this work in a 1999 3 series e46. as mine is the 256s4..
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Old 03-06-2012, 12:38 PM   #2 (permalink)
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From what I can tell their is no difference. The displacement is the exact same. From what I can tell the S5 one is newer. Would it work? Yes.
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Old 03-06-2012, 02:20 PM   #3 (permalink)
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I agree with Vader... It is an M52 engine regardless of the "s4" or "s5". The s5 formed part of BMW's engine range re-vamp in 2002 (Very minor alterations) !
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Old 03-06-2012, 02:39 PM   #4 (permalink)
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was wanting to know. as when i enquired about a possible engine replacement at a local breakers yard they told me that it had to be the same as what was in. but never told me about the difference between the s4 and s5. said if it was fitted with a s4 then you have to put a s4 in... thanks for all your help. regards alan
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Old 03-06-2012, 02:40 PM   #5 (permalink)
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You should hopefully get the replacement unit with the ECU's as a rule, anyway...
If not, then a re-program "may" be required...
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Old 03-06-2012, 02:44 PM   #6 (permalink)
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hi. is the ecu unit in a x reg 525 e39 the same as the e46.
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Old 03-06-2012, 02:48 PM   #7 (permalink)
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Probably, but it would still need "Matching"...
Always try to aquire the original ECU's (ECM) with a replacement unit - saves pain and money later...
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Old 03-06-2012, 02:59 PM   #8 (permalink)
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thanks. just ive been offered a complete engine and ecu from this x reg 525.
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Old 03-06-2012, 03:19 PM   #9 (permalink)
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Hehehehe If you're happy with the price then go for it matey... Is it CONFIRMED as a good runner and a bit of warranty?
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Old 03-06-2012, 04:52 PM   #10 (permalink)
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hi. is the ecu unit in a x reg 525 e39 the same as the e46.
I think this depends on the year of the E46 your gonna transplant in. The E39 used a different engine then te E46 dependent on model year. The ECU itself in terms of the unit should be the same. It's the software you would have to worry about. As Dabsy said a "re flashing" might be nessecary.
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Old 03-06-2012, 04:59 PM   #11 (permalink)
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mine is a e46 1999. the 525 is a 2000. said it was very good runner 82000 miles. m54tu25 engine
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Old 03-06-2012, 08:04 PM   #12 (permalink)
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What's the reason you need to swap engines?
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Old 03-07-2012, 12:38 PM   #13 (permalink)
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