10w40 motor oil
Worth a lookShows low returns (0.5%), but strong incumbent ratings (4.8★) keeps it on the watch list.
Returns
Incredible0.5%return rate — above 5% kills the launch gate
Avg price
Incredible$26.46avg listing price — sweet spot $15–$100
Price range
Great$6.47–$64.15cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great7.2%search→purchase rate — share of searches ending in a sale
Market size
Good$552K$552K/yr · 288K searches
Growth
Good+31.6%90-day search growth — must beat 0% to launch
Review moat
Okay2,921.59avg incumbent reviews — the moat a new listing must climb
Competition
Okay69%top-5 click share — leaders hold, buyers still browse
Brand share
Bad91%top-5 brand share — brand-locked demand
Quality gap
Bad4.8★avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, 10w40 motor oil is a $552K/yr Amazon United States market (288K searches/yr). The top 5 brands hold 91% of demand. Demand peaks in Apr–May. Verdict: Worth a look — 53/100.
Data updated Jul 9, 2026 · scored weekly · How we score niches
10w40 motor oil market data
- Units sold / yr
- 25K–30K
- avg 1,000–1,250/product
- Revenue / yr
- $662K–$794K
- units × avg price
- Conversion rate
- 7.2%
- Avg BSR
- #56
- Page quality
- 0%
- Prime
- 95%
- Sponsored
- 68%
- Out of stock
- 0.3%
- Avg brand age
- 92 months
- Avg seller age
- 150 days
Competition & brand share
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.Brands
10 rising
Sellers
130
Top-5 brand share
91%
Top 20: 100%
Top-5 click share
69%
Top 20: 98%
Open market
6%
- Valvoline39%
- Castrol28%
- Mobil17%
- Pennzoil5%
- Lucas Oil3%
- Kawasaki3%
- Open — no brand owns it (4 brands, 6%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +31.6% search growth over the last 90 days.Peak months: Apr, May · busiest ÷ quietest = 2.1×
Top 10w40 motor oil search terms
- 10w40 motor oil73K/yr
- 10w4035K/yr
- 10w40 synthetic motor oil30K/yr
- 10w40 full synthetic oil15K/yr
- 10w-40 full synthetic oil15K/yr
- 10w-4013K/yr
- motor oil 10w-409K/yr
- mobil 1 10w40 full synthetic oil10K/yr
- castrol 10w4012K/yr
- 10w 40 full synthetic motor oil10K/yr
Top 10w40 motor oil products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 22 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Valvoline High Mileage with MaxLife Technology SAE 10W-40 Synthetic Blend Motor Oil 5 QT
Valvoline$19.894.8★28,037 rev
Mobil 1 High Mileage Full Synthetic Motor Oil 10W-40 5 Quart
Mobil$26.074.8★1,719 rev
Castrol GTX High Mileage 10W-40 Synthetic Blend Motor Oil 5 Quarts
Castrol$20.694.8★3,863 rev
Castrol GTX 10W-40 Conventional Motor Oil 5 Quarts
Castrol$23.194.8★1,862 rev
Valvoline 4-Stroke Motorcycle Full Synthetic 10W-40 Motor Oil 1 Quart
Valvoline$10.034.8★3,136 rev
Newest
by launch date
Valvoline 4-Stroke Motorcycle Full Synthetic SAE 10W-40 Motor Oil 1 QT Case of 6
Valvoline$51.913,136 rev
STP Premium Synthetic Blend 4 Cycle Small Engine Oil SAE 10w30 Motor Oil for Lawnmowers Generators Tractors Snow Blowers and More 32 fl oz
STP$11.003,439 rev
Pack of 5 Kawasaki 99969-6296 Genuine OEM K-Tech SAE 10W-40 4-Cycle Engine Oil
Kawasaki$34.842,103 rev
Valvoline Daily Protection 10W-40 Conventional Motor Oil 5 QT (Packaging May Vary)
Valvoline$24.96576 rev
TRIAX XTerra 4T 10W-40 Full Synthetic 4 Stroke Engine Oil | For Motorcycles ATVs Quads & Snowmobiles | Exceeds JASO MA2 & API SL/SM/SN | True All Season | Race Ready (1 Gallon)
Triax$35.13370 rev
Trending
90-day click momentum
Castrol GTX High Mileage 10W-30 Synthetic Blend Motor Oil 5 Quarts
Castrol$16.834.8★
Pennzoil High Mileage 10W-40 Motor Oil 5 Quart
Pennzoil$21.754.7★
Valvoline 4-Stroke Motorcycle 10W-40 Motor Oil 1 Quart
Valvoline$6.474.8★
Castrol GTX High Mileage 10W-40 Synthetic Motor Oil 1 Quart Pack of 6
Castrol$40.474.8★
Kawasaki K-Tech SAE 10W-40 Engine Oil Quart #99969-6296
Kawasaki$11.084.8★
What buyers say about 10w40 motor oil
What buyers praise and complain about, mined from review topics.What buyers love
“Good price”
“great product, as advertised”
“Best oil”
“As advertised”
“great for older cars”
“Use this oil all the time in my Hot Rods- works well- good value-”
“Easy to use”
“Stopped oil leaks”
“My Engine loves it”
“a great fit for my bike”
What buyers complain about
“a couple dollars cheaper here”
“The lid was not tightened and the oil leaked all over the box and the filters”
“Small engine oil”
“It's slippery”
“Castrol GT has higher mechanical viscosity breakdown”
“This oil is NOT compatible with a Bombardier Traxter 500”
“Before, it would stop as soon as it started, which was very troublesome, especially when it was cold”
“Not enough miles to determine the quality”
“I dont like the smell at first”
Top return reasons
Common questions
- Is 10w40 motor oil profitable to sell on Amazon United States?
- The niche generates $552K/yr across 22 tracked products. 90-day search growth is +31.6%. Flapen's verdict: Worth a look (53/100).
- How competitive is the 10w40 motor oil niche?
- 10 brands and 130 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 91% of demand.
- What do buyers complain about in 10w40 motor oil?
- Top complaints mined from reviews: Value For Money, Leak-Proof, Size-Overall. The return rate is 0.5%.
- When does demand for 10w40 motor oil peak?
- Demand peaks in Apr–May; the busiest month runs 2.1× the quietest.
- What does it cost to enter the 10w40 motor oil niche?
- Listings span $6.47–$64.15; the average listing price is $26.46 (sweet spot $15–$100). The average incumbent carries 2,922 reviews — the moat a new listing must climb.