2018 Mercedes S Class alternator — 231 Type (SL models), SL550 price snapshot
- Low
- $86
- Average
- $189
- High
- $365
Year & trim-specific price guide
Used 2018 Mercedes S Class Alternator — 231 Type (SL models), SL550 prices
Trim-specific pricing for the 231 Type (SL models), SL550 variant of the 2018 Mercedes S Class alternator, built from 49 real salvage yard listings with condition grade detail.
SKWritten bySaurabh Kumar · Co-Founder & CTO
SK
Saurabh Kumar
Co-Founder & CTO, Part Price Guide
Built the pricing pipeline that collects and normalizes used OEM part listings from salvage yards and online marketplaces across the US.
ASReviewed byAmbika Sharma · Co-Founder & COO
Last updatedOct 3, 2026AS
Ambika Sharma
Co-Founder & COO, Part Price Guide
12 years of project management and technical operations experience. Reviews price guides for sample size, fitment accuracy, and data freshness.
Price summary
A used 2018 Mercedes S Class alternator (231 Type (SL models), SL550) costs $86 to $365, with a median asking price of $166. Based on 49 priced salvage yard listings across the US, updated Oct 3, 2026. Prices exclude shipping, core charges, and installation.
Grade A (excellent)$166
Grade B (good)$150
USD
Condition comparison
Price by part grade
Grade AClean / low wear$90–$36545 listings
Grade BStandard used$86–$2374 listings
| Grade | Price range | Relative range | Listings |
|---|---|---|---|
| Grade AClean / low wear | $90–$365 | 45 | |
| Grade BStandard used | $86–$237 | 4 |
Median by grade
Grade price comparison
Grade A$166
Grade B$150
Median asking price by seller-reported condition grade · $86–$365 overall range
Trim-specific context
How does the 231 Type (SL models), SL550 compare?
This pricing covers the 231 Type (SL models), SL550 variant of the 2018 Mercedes S Class alternator, based on 49 priced listings. Its $166 median is 14% below the 2018 Mercedes S Class alternator overall median of $193.
There are 10 other alternator variants available for the 2018 Mercedes S Class.
Pricing is not a fitment guarantee. Match the VIN, part number, engine or drivetrain, and seller-listed variant before ordering.
Same trim, other years
231 Type (SL models), SL550 in other model years
Same year, other trims
What other 2018 Mercedes S Class alternator variants are available?
231 Type (SL models), SL450
44 listings$125$60 – $275231 Type (SL models), SL63
38 listings$199$36 – $400217 Type (S models, coupe and convertible), S560
34 listings$135$100 – $315217 Type (S models, coupe and convertible), S63
26 listings$575$300 – $788222 Type (S models, sedan), S560
18 listings$182$85 – $299222 Type (S models, sedan), S560 Maybach
18 listings$182$85 – $299222 Type (S models, sedan), S63
16 listings$488$375 – $671222 Type (S models, sedan), S650 Maybach
7 listings$524$79 – $608222 Type (S models, sedan), S450, AWD
2 listings$295$250 – $295222 Type (S models, sedan), S450, RWD
2 listings$525$291 – $525Back to full guide
2018 Mercedes S Class alternator — all trims
Common questions
2018 Mercedes S Class alternator (231 Type (SL models), SL550) FAQ
How much is a used 2018 Mercedes S Class alternator (231 Type (SL models), SL550)?
Based on 49 priced salvage-yard listings, a used 2018 Mercedes S Class alternator in the 231 Type (SL models), SL550 variant lists between $86 and $365, with a median asking price of $166.
Which years use the 231 Type (SL models), SL550 alternator?
The 231 Type (SL models), SL550 variant appears in model years 2017, 2018, 2019, 2020. Prices and availability may differ by year.