Mercedes-Benz S-Class Glow Plugs Replacement Parts
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What to check when buying a used Mercedes-Benz S-Class glow plugs
A used glow plugs that fits one vehicle won't always fit another - even within the same model range. These questions help breakers match stock to your exact vehicle before they quote:
- State the engine code if known
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Used glow plugs for other Mercedes-Benz models
Fitment questions
Do Mercedes S-Class models even have glow plugs?
Only the diesel variants of the S-Class have glow plugs — petrol engines do not use them, so if your car is a petrol S-Class (for example an S350, S500, S550, or S63 AMG), glow plugs simply do not exist on your vehicle. Diesel S-Class models such as the S300d, S350d, and S400d are fitted with glow plugs as part of the cold-start system. If you have a petrol S-Class and are chasing a cold-start or misfire fault, you may want to look at ignition coils or spark plugs instead.
Will glow plugs from a W220 S-Class fit a W221 S-Class?
The W220 ran from 1998 to 2005 and the W221 from 2005 to 2013, and although both generations offered diesel variants, the engine codes changed significantly between them — the W220 diesel used units such as the OM613 and OM648, while the W221 diesel used the OM642 V6 family. Because glow plugs follow the engine code rather than the generation or body, these parts are very unlikely to interchange, and you should confirm the exact engine code from your V5 or a VIN check before ordering. A good breaker will be able to match the plug to your engine code directly.
Do glow plugs from a W221 S350d fit a W222 S350d?
The W221 generation ran to 2013 and the W222 launched in 2013, and while both S350d models used variants of the Mercedes OM642 3.0-litre V6 diesel, specification details including ancillary components can change across a generation boundary even when the headline engine family looks the same. Glow plug fitment follows the specific engine code stamped on your block, so supply your full engine code and registration to the breaker and ask them to confirm before purchasing. Never assume a match based on badge or displacement alone.
Does the trim level affect which glow plugs I need — for example, does an S-Class AMG Line need different ones to a standard SE?
Trim level has no effect whatsoever on glow plug fitment — AMG Line, SE, and any other trim designation on the S-Class are purely cosmetic or equipment-level distinctions that do not change the engine. What determines glow plug compatibility is the engine code, so two S350d models of the same generation with different trim levels will take identical glow plugs. Focus entirely on the engine code from your V5 rather than the trim badge when sourcing a used set from a breaker.
How many glow plugs does a diesel S-Class have?
The number of glow plugs matches the number of cylinders — the S300d and S350d use a six-cylinder OM642 engine and therefore have six glow plugs, while the S400d uses a six-cylinder unit as well. Breakers will typically sell a full set, which is the recommended approach since if one plug has failed the others are likely at a similar point in their life. Confirm the cylinder count against your engine code with the breaker to make sure you receive the correct quantity.
I have a used S-Class and don't know the engine code — how do I make sure I get the right glow plugs?
The engine code is the single most important detail for sourcing glow plugs, and the easiest ways to find it are to check your V5 registration document or run a VIN check through a reputable online service or a Mercedes dealer. Once you have the code — for example OM642 on many S-Class diesels — supply it directly to the breaker alongside your registration, and they can confirm the exact plug specification. Ordering by year or badge alone risks getting the wrong part, as engine specifications can change mid-production run.