10w40 engine oil
Worth a lookShows low returns (0.4%), but strong incumbent ratings (4.7★) keeps it on the watch list.
Returns
Incredible0.4%return rate — above 5% kills the launch gate
Avg price
Great£18.94avg listing price — sweet spot $15–$100
Conversion
Great8.7%search→purchase rate — share of searches ending in a sale
Review moat
Good504.79avg incumbent reviews — the moat a new listing must climb
Price range
Good£5.95–£33.22cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Okay57%top-5 click share — leaders hold, buyers still browse
Growth
Okay+12.9%90-day search growth — must beat 0% to launch
Market size
Okay£167K£167K/yr · 102K searches
Brand share
Bad90%top-5 brand share — brand-locked demand
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United Kingdom niche tracking, 10w40 engine oil is a £167K/yr Amazon United Kingdom market (102K searches/yr). The top 5 brands hold 90% of demand. Demand peaks in May–Jun–Jul. Verdict: Worth a look — 52/100.
Data updated Jul 18, 2026 · scored weekly · How we score niches
10w40 engine oil market data
- Units sold / yr
- 8K–10K
- avg 250–500/product
- Revenue / yr
- £152K–£189K
- units × avg price
- Conversion rate
- 8.7%
- Avg BSR
- #83
- Page quality
- 0%
- Prime
- 83%
- Sponsored
- 71%
- Out of stock
- 10.0%
- Avg brand age
- 79 months
- Avg seller age
- 187 days
Competition & brand share
The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.Brands
10 falling
Sellers
51
Top-5 brand share
90%
Top 20: 100%
Top-5 click share
57%
Top 20: 95%
Open market
6%
- Castrol73%
- Carlube6%
- Lucas Oil4%
- Motul4%
- ELF4%
- Comma3%
- Open — no brand owns it (4 brands, 6%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +12.9% search growth over the last 90 days.Peak months: May, Jun, Jul · busiest ÷ quietest = 2.6×
Top 10w40 engine oil search terms
- 10w40 motorcycle oil29K/yr
- 10w40 engine oil23K/yr
- motorcycle oil9K/yr
- 10w 40 motorcycle oil6K/yr
- 10w 40 engine oil5K/yr
- 10w405K/yr
- motorbike oil4K/yr
- 10 40 motorcycle oil4K/yr
- castrol power 1 4t 10w-40 motorcycle oil4K/yr
- 10w40 semi synthetic oil4K/yr
Top 10w40 engine 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 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Castrol POWER1 4T 10W-40 Motorcycle Oil 4L
Castrol£26.064.8★1,912 rev
Castrol POWER1 ULTIMATE 4T 10W-40 Motorcycle Oil 1L
Castrol£9.304.8★434 rev
Castrol POWER1 4T 10W-40 Motorcycle Oil 1L
Castrol£9.754.8★1,912 rev
Castrol POWER1 ULTIMATE 4T 10W-40 Motorcycle Oil 4L
Castrol£33.224.9★285 rev
Castrol GTX 10W-40 A3/B4 Engine Oil 5L
Castrol£23.124.7★921 rev
Newest
by launch date
Motorcycle Engine Oil 10W-40 Semi-Synthetic 4T HC-Tech Motor Oil for Scooters & Motorbikes High Performance 5000 1L
Kactus£13.454 rev
Lucas Oil 47068 Semi-Synthetic 10W-40 Engine Oil - 1 Litre
Lucas Oil£5.9542 rev
Castrol POWER1 ULTIMATE 4T 10W-40 Motorcycle Oil 1L
Castrol£9.30434 rev
Castrol POWER1 ULTIMATE 4T 10W-40 Motorcycle Oil 4L
Castrol£33.22285 rev
ELF Moto 4T Road 10W40 Motorcycle Oil 4-Stroke Engine Oil - API SN JASO MA2-4L
ELF£25.22295 rev
Trending
90-day click momentum
Motul 104056 Oil
Motul£28.994.8★
Castrol GTX 10W-40 A3/B4 Engine Oil 4L
Castrol£21.684.7★
Comma XFXS5L X-Flow Type XS 10W40 Oil 5 Litre
Comma£21.084.7★
Carlube Triple R 10W-40 ACEA A3/B4 API SN+ Synthetic Engine Oil R-TEC 31 5L
Carlube£20.944.4★
Castrol POWER1 ULTIMATE 4T 10W-40 Motorcycle Oil 1L
Castrol£9.304.8★
What buyers say about 10w40 engine oil
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent value”
“Seems be a good oil”
“Just what I needed”
“High-quality fully synthetic oil”
“easy to use”
“quieter when using Castrol Power 1”
“Good protection”
“Does the job well, the best part if the nozzles, it helps”
“No spills, just don't get carried away while filling up the engine”
“Also long lasting”
What buyers complain about
“Not suitable for motorbikes”
“dark gray in colour”
“It is oil”
“Quite cheap and doing what is supposed to be doing”
“Leak”
“More expensive”
Top return reasons
Common questions
- Is 10w40 engine oil profitable to sell on Amazon United Kingdom?
- The niche generates £167K/yr across 24 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +12.9%. Flapen's verdict: Worth a look (52/100).
- How competitive is the 10w40 engine oil niche?
- 10 brands and 51 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 90% of demand.
- What do buyers complain about in 10w40 engine oil?
- Top complaints mined from reviews: Compatibility-Overall, Color, Lubrication. The return rate is 0.4%.
- When does demand for 10w40 engine oil peak?
- Demand peaks in May–Jun–Jul; the busiest month runs 2.6× the quietest.
- What does it cost to enter the 10w40 engine oil niche?
- Listings span £5.95–£33.22; the average listing price is £18.94 (sweet spot $15–$100). The average incumbent carries 505 reviews — the moat a new listing must climb.