5w40 Full Synthetic Oil Diesel
FailThe products selling today already average 4.8★, so 5w40 Full Synthetic Oil Diesel is a Fail.
- Flapen Score
- 34 / 100Ranks 6,811 of 7,287 Automotive niches · −15 vs the category median of 4934
- Market size
- $61K/yr37K searches / yr
- 90-day growth
- -18.3%search demand this quarter
- Competition
- 73%top-5 click share · 10 brands · 100 sellers
Flapen Score
5w40 Full Synthetic Oil Diesel against its category
The dotted line is the Automotive average. Past it, 5w40 Full Synthetic Oil Diesel is stronger. Inside it, weaker.
Market
The 5w40 Full Synthetic Oil Diesel market on Amazon at a glance
Shoppers on Amazon United States searched for 5w40 Full Synthetic Oil Diesel 37K times last year and spent an estimated $61K. The top 5 brands take 91% of clicks. Flapen scores it 34 out of 100, a Fail.
01 · Demand
An estimated 2.8% of those searches ended in a purchase.
Shoppers searched for this 37K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 2.8% of those searches ended in a purchase. Searches in the last 90 days moved -18.3% against the 90 days before. Searches, conversion and average price together put the market at an estimated $61K a year.
- Searches, last 12 months
- 37K
- Growth, 90 days vs prior 90
- -18.3%
- Conversion, latest week
- 2.8%
- Market size, estimated
- $61Ka year
- Peak month
- November1.6× the quietest month
- Top search term
- 5w40 diesel oil27K searches a year
02 · Price
A sale here is worth $59.65.
Listings sell for $59.65 on average, from $22.00 to $163.04. Amazon reports units sold in ranges. This niche sold 3K to 3K a year. The average listing sells 100 to 250 of them. At $59.65 that is $6K to $15K a year per listing.
- Average price
- $59.65inside the $15 to $100 sweet spot
- Price range
- $22.00–$163.04
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 3K–3K
- Units per listing a year
- 100–250
- Revenue per listing a year
- $6K–$15K
- Returns
- 0.6%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is reviews.
65% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #305 within Oils & Fluids. It carries 2,847 reviews at 4.78 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 65%
- Prime listings
- 100%
- Out of stock, average day
- 0.0%
- Average rank
- #305in Oils & Fluids
- Average rating
- 4.78 starsAmazon United States average 4.42 stars
- Average reviews
- 2,847per listing
- Listings tracked
- 17
04 · Newcomers
0 of last year's 1 launches cleared the first-year sales bar.
1 products launched here in the last 12 months. 0 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 96 months on average, so the names here are established.
- Launched, last 12 months
- 1
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 96 months
Products
Top 5w40 Full Synthetic Oil Diesel 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
Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil 1 Gallon
- Price
- $23.54
- Rating
- 4.8/5
- Reviews
- 12,007
- Age
- 9y ago

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil 1 Gallon (3 Pack)
- Price
- $67.96
- Rating
- 4.8/5
- Reviews
- 12,007
- Age
- 9y ago

Mobil 1 Turbo Diesel Truck Full Synthetic Motor Oil 5W-40 1 Gal
- Price
- $29.82
- Rating
- 4.8/5
- Reviews
- 695
- Age
- 16y ago

Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic Diesel Engine Oil 1 GA Case of 3
- Price
- $97.74
- Rating
- 4.7/5
- Reviews
- 1,933
- Age
- 9y ago

Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic Diesel Engine Oil 1 GA
- Price
- $33.63
- Rating
- 4.7/5
- Reviews
- 1,933
- Age
- 22y ago
Trending
estimated 90-day click momentum
Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil 1 Gallon
- Price
- $23.54
- Rating
- 4.8/5
- Reviews
- 12,007
- Age
- 9y ago

Royal Purple 83540 Duralec Super 5W-40 CK-4 Motor Oil 1 Gallon (Pack of 1)
- Price
- $39.31
- Rating
- 5.0/5
- Reviews
- 10
- Age
- 11y ago

Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil 2.5 Gallon (2 Pack)
- Price
- $163.04
- Rating
- 4.8/5
- Reviews
- 12,007
- Age
- 9y ago

Valvoline Premium Blue Extreme SAE 5W-40 Full Synthetic Diesel Engine Oil 1 GA Case of 3
- Price
- $97.74
- Rating
- 4.7/5
- Reviews
- 1,933
- Age
- 9y ago

Schaeffer Manufacturing Co. 9000CK4-012 SynShield OTR Plus Full Synthetic Diesel Engine Oil 5W-40 1-Quart Bottle (Pack of 12)
- Price
- $154.55
- Rating
- 4.7/5
- Reviews
- 66
- Age
- 6y ago
Newest
by launch date
Docs Diesel 5W-40 Full Synthetic Heavy Duty Diesel Engine Oil API CK-4 for Cummins Powerstroke Duramax Eco Diesel DPF and EGR Safe | 1-Gallon
- Price
- $38.30
- Rating
- 4.8/5
- Reviews
- 10
- Age
- 9mo ago

Valvoline Heavy Duty Full Synthetic 15W-40 Diesel Engine Oil 1 Gallon
- Price
- $22.00
- Rating
- 4.8/5
- Reviews
- 172
- Age
- 1y ago

LIQUI MOLY Special Tec AA SAE 5W-40 Diesel | 5 L | Fully synthetic engine oil | SKU: 20426
- Price
- $56.93
- Rating
- 5.0/5
- Reviews
- 23
- Age
- 5y ago

Schaeffer Manufacturing Co. 9000CK4-006S SynShield OTR Plus Full Synthetic Diesel Engine Oil 5W-40 1-Gallon Bottle
- Price
- $53.52
- Rating
- 4.8/5
- Reviews
- 505
- Age
- 6y ago

Schaeffer Manufacturing Co. 9000CK4-012 SynShield OTR Plus Full Synthetic Diesel Engine Oil 5W-40 1-Quart Bottle (Pack of 12)
- Price
- $154.55
- Rating
- 4.7/5
- Reviews
- 66
- Age
- 6y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 73% of clicks. A locked shelf that new listings rarely crack.
Brands
10 flat
Sellers
100
Est. top-5 brand share
91%
Top 20: 100%
Est. top-5 click share
73%
Top 20: 100%
Open market
7%
- Shell Rotella51%
- Valvoline18%
- Mobil13%
- Schaeffer Manufacturing Co6%
- Royal Purple3%
- Ford2%
- Open — no brand owns it (4 brands, 7%)
Demand
5w40 Full Synthetic Oil Diesel search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.6×
Search terms
Top 5w40 Full Synthetic Oil Diesel search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- 5w40 diesel oil27K/yr
- 5w40 full synthetic oil diesel9K/yr
- 5w-40 diesel engine oil1K/yr
Reviews and returns
What reviews say buyers love and hate about 5w40 Full Synthetic Oil Diesel
We read the reviews and the return reasons for every product selling here.
“Was a lot cheaper then tacking to the dealer”
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.
18 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 5w40 Full Synthetic Oil Diesel 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









