May have been scammed on M54

[TheEnm]

So I picked up an M54’s yesterday for my upcoming e36 M54B30 swap, but I think the seller scammed me and sold me a 2.5L instead of a 3.0L. Are there any concrete ways to tell them apart? It’s got a code “256S5” on it and code “7502900 01” let me know if there’s anywhere else to look. I can’t find the vin on the back of the head. Thanks


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[justinca540i]

You could always pull out the DISA to examine length

[TheEnm]

You could always pull out the DISA to examine length

That’s the thing... the only thing he “sold” before I got there was the disa valve


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[gdavid]

So I picked up an M54’s yesterday for my upcoming e36 M54B30 swap, but I think the seller scammed me and sold me a 2.5L instead of a 3.0L. Are there any concrete ways to tell them apart? It’s got a code “256S5” on it and code “7502900 01” let me know if there’s anywhere else to look. I can’t find the vin on the back of the head. Thanks


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Remove a coil and spark plug and measure the stroke with a dowel rod or something else long thin and clean. B30 should have 89.6 mm of travel.

[Muzz258]

Sorry to tell you, but you have been scammed. Its a 2.5 L M54 engine, M54B25.

You have a “256S5”, the 25 at the beginning says that it is a 2.5 L engine. See the full decode in the attached doc.

[X3456]

You could look at the...maf...on the 2.5 it's more mini in size compared to the 3.0 .

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[whiskychaser]

As above. Put your VIN into realoem and under engine/short motor it will say 306S3 i.e. 3 litre, 6 cylinder. Change that to 2.5 litre and it will come up 256S5 - which is what you appear to have been sold