5w40 Engine Oil
MaybeAn estimated 0.6% of orders come back. But the products selling today already average 4.8★, so 5w40 Engine Oil is a Maybe.
- Flapen Score
- 50 / 100Top 43% of 811 Automotive niches · +1 vs the category median of 4950
- Market size
- £188K/yr119K searches / yr
- 90-day growth
- +19.2%search demand this quarter
- Competition
- 63%top-5 click share · 8 brands · 53 sellers
Flapen Score
5w40 Engine Oil against its category
The dotted line is the Automotive average. Past it, 5w40 Engine Oil is stronger. Inside it, weaker.
Market
The 5w40 Engine Oil market on Amazon at a glance
Shoppers on Amazon United Kingdom searched for 5w40 Engine Oil 119K times last year and spent an estimated £188K. The top 5 brands take 93% of clicks. Flapen scores it 50 out of 100, a Maybe.
01 · Demand
An estimated 6.8% of those searches ended in a purchase.
Shoppers searched for this 119K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. An estimated 6.8% of those searches ended in a purchase. Searches in the last 90 days moved +19.2% against the 90 days before. Searches, conversion and average price together put the market at an estimated £188K a year.
- Searches, last 12 months
- 119K
- Growth, 90 days vs prior 90
- +19.2%
- Conversion, latest week
- 6.8%
- Market size, estimated
- £188Ka year
- Peak month
- May1.4× the quietest month
- Top search term
- 5w40 engine oil44K searches a year
02 · Price
A sale here is worth £23.02.
Listings sell for £23.02 on average, from £7.44 to £42.20. Amazon reports units sold in ranges. This niche sold 8K to 10K a year. The average listing sells 250 to 500 of them. At £23.02 that is £6K to £12K a year per listing.
- Average price
- £23.02inside the $15 to $100 sweet spot
- Price range
- £7.44–£42.20
- Amazon United Kingdom median price
- £12.12across 27,606 niches
- Units sold a year
- 8K–10K
- Units per listing a year
- 250–500
- Revenue per listing a year
- £6K–£12K
- Returns
- 0.6%of orders · Amazon United Kingdom median 0.6%
03 · Entry bar
The bar here is reviews.
82% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 9.1% of listings are out of stock. The average listing ranks #93 within Oils & Fluids. It carries 1,728 reviews at 4.76 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 82%
- Prime listings
- 100%
- Out of stock, average day
- 9.1%
- Average rank
- #93in Oils & Fluids
- Average rating
- 4.76 starsAmazon United Kingdom average 4.36 stars
- Average reviews
- 1,728per listing
- Listings tracked
- 17
04 · Newcomers
Brands here are established.
The brands on the shelf have sold for 88 months on average, so the names here are established.
- Launched, last 12 months
- 0
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 88 months
Products
Top 5w40 Engine Oil 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 18, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Castrol EDGE 5W-40 Advanced Fully Synthetic Engine Oil Meets ACEA C3 & API SN/CF Specifications 4L
- Price
- £25.99
- Rating
- 4.8/5
- Reviews
- 1,123
- Age
- 3y ago

Castrol EDGE 5W-40 Advanced Fully Synthetic Engine Oil Meets ACEA C3 & API SN/CF Specifications 1L
- Price
- £10.94
- Rating
- 4.8/5
- Reviews
- 1,123
- Age
- 3y ago

Castrol EDGE 5W-40 Advanced Fully Synthetic Engine Oil Meets ACEA C3 & API SN/CF Specifications 5L
- Price
- £33.69
- Rating
- 4.8/5
- Reviews
- 1,123
- Age
- 3y ago

Redex 5w-40 Fully Synthetic Engine Oil MB VW RN 2 Litre
- Price
- £14.61
- Rating
- 4.7/5
- Reviews
- 127
- Age
- 5y ago

Castrol MAGNATEC 5W-40 C3 Engine Oil 4L
- Price
- £24.48
- Rating
- 4.8/5
- Reviews
- 260
- Age
- 3y ago
Trending
estimated 90-day click momentum
Castrol MAGNATEC 5W-40 C3 Engine Oil 4L
- Price
- £24.48
- Rating
- 4.8/5
- Reviews
- 260
- Age
- 3y ago

LIQUI MOLY Synthoil High Tech 5W-40 | 5 L | Synthesis technology motor oil | SKU: 1856
- Price
- £37.83
- Rating
- 4.7/5
- Reviews
- 157
- Age
- 10y ago

Castrol EDGE 5W-40 Advanced Fully Synthetic Engine Oil Meets ACEA C3 & API SN/CF Specifications 5L
- Price
- £33.69
- Rating
- 4.8/5
- Reviews
- 1,123
- Age
- 3y ago

Castrol EDGE 5W-40 M Advanced Fully Synthetic Engine Oil Meets ACEA C3 & API SN Specifications 5L
- Price
- £42.20
- Rating
- 4.9/5
- Reviews
- 60
- Age
- 3y ago

Castrol MAGNATEC 5W-40 DPF Engine Oil 1L
- Price
- £7.44
- Rating
- 4.7/5
- Reviews
- 391
- Age
- 3y ago
Newest
by launch date
MOTORWORLD Fully Synthetic C2/C3 Engine Oil 5W-40 Advanced Full Synthetic Motor Oil for Petrol & Diesel Engines Low SAPS ACEA C2 C3 Approved 5L
- Price
- £24.74
- Rating
- 4.7/5
- Reviews
- 19
- Age
- 1y ago

Castrol MAGNATEC 5W-40 C3 Engine Oil 4L
- Price
- £24.48
- Rating
- 4.8/5
- Reviews
- 260
- Age
- 3y ago

Castrol EDGE 5W-40 Advanced Fully Synthetic Engine Oil Meets ACEA C3 & API SN/CF Specifications 4L
- Price
- £25.99
- Rating
- 4.8/5
- Reviews
- 1,123
- Age
- 3y ago

Castrol EDGE 5W-40 Advanced Fully Synthetic Engine Oil Meets ACEA C3 & API SN/CF Specifications 1L
- Price
- £10.94
- Rating
- 4.8/5
- Reviews
- 1,123
- Age
- 3y ago

Castrol EDGE 5W-40 Advanced Fully Synthetic Engine Oil Meets ACEA C3 & API SN/CF Specifications 5L
- Price
- £33.69
- Rating
- 4.8/5
- Reviews
- 1,123
- Age
- 3y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 63% of clicks. Leaders hold, but buyers still shop past them.
Brands
8 falling
Sellers
53
Est. top-5 brand share
93%
Top 20: 100%
Est. top-5 click share
63%
Top 20: 100%
Open market
4%
- Castrol71%
- Redex7%
- Carlube6%
- Liqui Moly6%
- TotalEnergies3%
- Comma3%
- Open — no brand owns it (2 brands, 4%)
Demand
5w40 Engine Oil search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.4×
Search terms
Top 5w40 Engine Oil search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- 5w40 engine oil44K/yr
- 5w4014K/yr
- 5w 40 fully synthetic engine oil12K/yr
- castrol edge 5w409K/yr
- engine oil 5w409K/yr
- 5w40 engine oil fully synthetic9K/yr
- 5w-40 engine oil6K/yr
- 5w 40w engine oil5K/yr
- 5w 404K/yr
- 5w40 oil4K/yr
Reviews and returns
What reviews say buyers love and hate about 5w40 Engine Oil
We read the reviews and the return reasons for every product selling here.
“While the price point is a bit higher”
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 5w40 Engine Oil 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









