Radiator Additives & Sealants price guide
This page summarizes typical eBay prices for Radiator Additives & Sealants based on recent listing medians.
What you'll usually pay
💡 Used ones cost about 62% more here.
👉 In short easy summary
The overall eBay market median is 27.99, with a new-median of 29.16 and a used-median of 47.1. The biggest price differences show up by Type (Radiator Stop Leak median 19.8, deltaPct -29 vs Radiator Sealer median 28.74, deltaPct 3, and Cooling System Cleaner median 27.25, deltaPct -3). Brand and volume also vary: Bar's is 19.43 (deltaPct -31) while Not Specified is 29.16 (deltaPct 4), and 12oz is 17.99 (deltaPct -36) vs 16oz at 26.73 (deltaPct -5).
💚 Best value for your money
Price by type
Why? Types cluster around different medians, with Radiator Stop Leak lowest at 19.8 (deltaPct -29, 150 listings) and Radiator Sealer near the overall median at 28.74 (deltaPct 3, 51 listings).
🛒 Some on sale right now
Common questions
Are radiator stop leak products usually cheaper than sealers on eBay?
Yes—Radiator Stop Leak has a median of 19.8 (deltaPct -29), while Radiator Sealer has a median of 28.74 (deltaPct 3).
What’s the typical eBay price range for new vs used items in this category?
New items have a median of 29.16, while used items have a median of 47.1.
Do smaller volumes cost significantly less (12oz vs 16oz)?
12oz has a median of 17.99 (deltaPct -36) compared with 16oz at 26.73 (deltaPct -5).
How we got these numbers
Worked out from 200 live eBay listings (price range $9–$100, odd outliers ignored). These are asking prices, so use them as a guide. Last checked August 19, 2026.