Used Mercedes-Benz S350

What to know before buying: Mercedes-Benz S350

From 3 forum threads and 1 press test · updated 12/10/2026

What the reviews say

• The strongest evidence covers one 2006 W221 S350 with an M272 engine at 160,000 km; it is a single-owner case, not a reliability verdict on the entire model line.[1]one source
• The owner reported that a balance-shaft repair kit resolved the retarded-timing fault, although a separate P0410 code remained afterward.[1]one source
• The remaining evidence is limited: one source only asks about a 1995–96 S350 turbodiesel, while the qualitative text in the owner-review index is corrupted.[2][4]

Typical faults

• A 2006 W221 S350 with the M272 showed a Check Engine light and retarded-timing faults at 160,000 km; a balance-shaft repair kit resolved the issue.[1]one source

  160 000–160 000 km · 2006–2006 · M272

• The same car retained a P0410 secondary-air fault; the pump sounded strained when activated diagnostically despite renewed vacuum lines and an intake repair.[1]one source

  160 000–160 000 km · 2006–2006 · M272

Which engine and version to take

• Based on these sources, only consider an M272 with documented balance-shaft repair and no active timing faults; the evidence is insufficient for a broader engine comparison.[1]one source

What to avoid

• Avoid a 2006 M272 with active retarded-timing faults or no proof they were resolved; the sole documented case required balance-shaft repair.[1]one source

What to check at the inspection

• On a 2006 W221 with the M272, scan all engine faults, especially retarded-timing codes and P0410; an extinguished Check Engine light alone is not sufficient proof.[1]one source
• Request balance-shaft repair records and rescan the fault memory, because the reported car retained a separate engine fault after the first repair.[1]one source
• Activate the secondary-air pump with a diagnostic tool and listen for strained operation; that was how the pump in the P0410 case was described.[1]one source
• As a supplemental check not specific to the S350, inspect an older S-Class for rust at the arches and lower doors and test all electrics and the air conditioning; the source concerns an older S320.[3]one source
• On an older S-Class, compare pedal wear with the claimed mileage: a forum poster questioned the odometer because of a heavily worn brake pedal. This example is not an S350.[3]one source

Verdict

Sources

1. [1]clubmercedes.ro — Problema S350 - Mercedes Benz Forum · forum
2. [2]bhtuning.com — Mercedes S350 Turbodiesel - Kupovina | BHTuning.com · forum
3. [3]avtomobilizem.com — Poglej temo - Mercedes Benz S class - S3200 · forum
4. [4]drom.ru — Мерседес S-Класс 5 поколение отзывы владельцев · press

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