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#1
12-20-2022, 01:34 AM
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W221 Bluetec vs W212 Bluetec reliability
Hey all,
Looking to retire my 240D to weekend duty since I have a long freeway commute to work now and am looking for a daily upgrade. I'd like to stick with diesels given their relative efficiency, and am currently looking into the W221 S350 Bluetec and W212 E250 Bluetec. How is the reliability between the two, and which one would be more reliable overall? Would love some input from owners. Thanks!
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____________________________________________ 1983 Mercedes 240D (290k) 1983 Audi 4000S (93k) 1977 Porsche 924 (38k) 
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#2
12-20-2022, 07:35 AM
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While I don't own either, the S350 has the V6 which would be prone to the oil cooler seals issue...has the OM642, correct? $$$$$
I've never heard anything bad about the E250. The OM651 inline four is bulletproof. While you're looking, you might want to consider an 05-06 E320 CDI. Now that the warranty on the braking system is extended to 25 years, I don't see a weak spot in these cars. A lot less expensive than the E250.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#3
12-22-2022, 12:50 AM
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Yes I do believe it is the OM642. Thanks, actually totally forgot those existed. Might have to look for a low mileage example. E class seems like the perfect overall size for me
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____________________________________________ 1983 Mercedes 240D (290k) 1983 Audi 4000S (93k) 1977 Porsche 924 (38k)
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#4
12-23-2022, 12:14 PM
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All I have to say is that you are going from a Cessna to a Boeing 787 between the W123 240D and either of these cars.
I would be prepared with at least an iCarSoft MBII and a copy of the WIS (or a clone Xentry system), you are going to need it if you plan to do any DIY. I own 4 OM642s so if you have any questions let me know!
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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
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