Def
FailPrices span $12.58–$1401.02, mostly outside the sweet spot, so Def is a Fail.
- Flapen Score
- 49 / 100Ranks 3,500 of 7,287 Automotive niches · on the category median49
- Market size
- $6.7M/yr818K searches / yr
- 90-day growth
- -12.6%search demand this quarter
- Competition
- 61%top-5 click share · 10 brands · 118 sellers
Flapen Score
Def against its category
The dotted line is the Automotive average. Past it, Def is stronger. Inside it, weaker.
Market
The Def market on Amazon at a glance
Shoppers on Amazon United States searched for Def 818K times last year and spent an estimated $6.7M. The top 5 brands take 93% of clicks. Flapen scores it 49 out of 100, a Fail.
01 · Demand
An estimated 3.5% of those searches ended in a purchase.
Shoppers searched for this 818K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 3.5% of those searches ended in a purchase. Searches in the last 90 days moved -12.6% against the 90 days before. Searches, conversion and average price together put the market at an estimated $6.7M a year.
- Searches, last 12 months
- 818K
- Growth, 90 days vs prior 90
- -12.6%
- Conversion, latest week
- 3.5%
- Market size, estimated
- $6.7Ma year
- Peak month
- January1.3× the quietest month
- Top search term
- def392K searches a year
02 · Price
A sale here is worth $235.10.
Listings sell for $235.10 on average, from $12.58 to $1401.02. Amazon reports units sold in ranges. This niche sold 30K to 40K a year. The average listing sells 1,250 to 1,500 of them. At $235.10 that is $294K to $353K a year per listing.
- Average price
- $235.10above the $15 to $100 sweet spot
- Price range
- $12.58–$1401.02
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 30K–40K
- Units per listing a year
- 1,250–1,500
- Revenue per listing a year
- $294K–$353K
- Returns
- 0.3%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is low.
73% of listings pay for placement with sponsored ads. 23% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #74 within Oils & Fluids. It carries 283 reviews at 4.60 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 73%
- Prime listings
- 23%
- Out of stock, average day
- 0.0%
- Average rank
- #74in Oils & Fluids
- Average rating
- 4.60 starsAmazon United States average 4.42 stars
- Average reviews
- 283per listing
- Listings tracked
- 26
04 · Newcomers
3 of last year's 4 launches cleared the first-year sales bar.
4 products launched here in the last 12 months. 3 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 63 months on average, so the names here are established.
- Launched, last 12 months
- 4
- Successful launches
- 3Amazon's first-year sales bar
- Average brand age
- 63 months
Products
Top Def products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 9, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Blue Def DEF002-2PK Diesel Exhaust Fluid 2.5 Gallon 2 Pack
- Price
- $40.97
- Rating
- 4.6/5
- Reviews
- 1,647
- Age
- 10y ago

Blue Def DEF002-4PK Diesel Exhaust Fluid 2.5 Gallon 4 Pack
- Price
- $75.75
- Rating
- 4.6/5
- Reviews
- 980
- Age
- 10y ago

Blue Def DEF002-2PK Diesel Exhaust Fluid 2.5 Gallon 2 Pack
- Price
- $41.27
- Rating
- 4.8/5
- Reviews
- 217
- Age
- 5y ago

ACDelco GM Original Equipment 10-4022 Diesel Exhaust Emissions Reduction (DEF) Fluid - 1 gal white
- Price
- $12.58
- Rating
- 4.6/5
- Reviews
- 363
- Age
- 17y ago

BlueDEF Diesel Exhaust Fluid Synthetic & Deionized Water 2.5 Gallon Jug (6 Pack)
- Price
- $117.24
- Rating
- 4.7/5
- Reviews
- 79
- Age
- 7y ago
Trending
estimated 90-day click momentum
Hot Shots Secret Premium DEFender DEF Booster Additive 16 oz Diesel DEF Treatment for Diesel Exhaust Fluid Cleans and Prevents Crystal Build-Up
- Price
- $19.84
- Rating
- 4.7/5
- Reviews
- 387
- Age
- 3mo ago

Prime Guard PRIM00203 DEF Diesel Exhaust Fluid - 1 Gallon
- Price
- $15.98
- Rating
- 4.7/5
- Reviews
- 221
- Age
- 5y ago

BlueDEF DEF Fluid Pallet - Premium Blue DEF Fluid 40 Cases Diesel Exhaust Fluid 2.5 Gallon Case - Pack of 40 Jugs and 1 Pack of DEF Hero Heavy Duty Wipes
- Price
- $674.35
- Rating
- 5.0/5
- Reviews
- 2
- Age
- 6mo ago

Docs Diesel DEF Diesel Exhaust Fluid SCR Emissions Fluid for Diesel Trucks Pickups and Equipment DEF Tanks | 2.5-Gallons
- Price
- $27.96
- Rating
- 4.0/5
- Reviews
- 5
- Age
- 6mo ago

BlueDEF DEF001 Diesel Exhaust Fluid 55 Gallon Drum Bundle with Heavy Duty Wipes
- Price
- $280.74
- Rating
- 5.0/5
- Reviews
- 5
- Age
- 1y ago
Newest
by launch date
Hot Shots Secret Premium DEFender DEF Booster Additive 16 oz Diesel DEF Treatment for Diesel Exhaust Fluid Cleans and Prevents Crystal Build-Up
- Price
- $19.84
- Rating
- 4.7/5
- Reviews
- 387
- Age
- 3mo ago

BlueDEF DEF Fluid Pallet - Premium Blue DEF Fluid 40 Cases Diesel Exhaust Fluid 2.5 Gallon Case - Pack of 40 Jugs and 1 Pack of DEF Hero Heavy Duty Wipes
- Price
- $674.35
- Rating
- 5.0/5
- Reviews
- 2
- Age
- 6mo ago

Docs Diesel DEF Diesel Exhaust Fluid SCR Emissions Fluid for Diesel Trucks Pickups and Equipment DEF Tanks | 2.5-Gallons
- Price
- $27.96
- Rating
- 4.0/5
- Reviews
- 5
- Age
- 6mo ago

BlueDEF Fluid Tote Pre-Filled with 200 Gallons of Premium Diesel Exhaust Fluid - Heavy Duty 110V Electric Powered Metered Pumping System Installed - 20ft. Dispensing Hose - Auto-Shutoff Nozzle
- Price
- $1395.16
- Rating
- 0.0/5
- Reviews
- 0
- Age
- 1y ago

BlueDEF DEF001 Diesel Exhaust Fluid 55 Gallon Drum Bundle with Heavy Duty Wipes
- Price
- $280.74
- Rating
- 5.0/5
- Reviews
- 5
- Age
- 1y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 61% of clicks. Leaders hold, but buyers still shop past them.
Brands
10 rising
Sellers
118
Est. top-5 brand share
93%
Top 20: 100%
Est. top-5 click share
61%
Top 20: 94%
Open market
5%
- BlueDEF70%
- ACDelco9%
- DEF Hero6%
- Prime Guard5%
- Rislone3%
- Doc's Diesel2%
- Open — no brand owns it (4 brands, 5%)
Demand
Def search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.3×
Search terms
Top Def search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- def392K/yr
- def fluid262K/yr
- blue def37K/yr
- diesel exhaust fluid30K/yr
- blue def diesel exhaust fluid27K/yr
- def fluid for diesels26K/yr
- blue def platinum11K/yr
- def fluid 2.5 gallon6K/yr
- blue def platinum diesel exhaust fluid8K/yr
- def diesel exhaust fluid6K/yr
Reviews and returns
What reviews say buyers love and hate about Def
We read the reviews and the return reasons for every product selling here.
“Better price”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
19 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Def questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









