The data card on my 06 CDI reads as follows:

138A MB TEX-LEATHER, TWIN/ARTICO-GRAY

Does this indicate I have some combination of MB Tex and leather? If, so where do I have the MB Tex and where do I have the leather?

In addition to simply being curious, I want to figure out how best to take care of the interior.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Without a picture it is hard to tell. If you do have leather it will be on the seating surfaces only (where your body makes contact with the seat). The backs of the seats, door panels, etc. are MB Tex.

Yes that is fairly common for high end cars these days. Expensive leather where you will be sitting on it, Tex on the secondary surfaces.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

It's got leather inserts, surrounded by vinyl. Same as our late '90s E300 diesels.

However, it is possible that your CDI, if a Designo series, will be loaded up with leather in the door panels too. Tyler might shed some light on this, since he's owned a bunch of E320 CDIs.

IIRC, the standard spec 2006 has leather inserts in the front seats with tex trim, and the backseat is entirely tex. I remember this because my brother bought one new in fall of 2005 and thought that was just great for a family car where kids would use the back. BTW, he still has it.