5w40 Engine Oil
5w40 Engine Oil shows low returns (0.6%), but strong incumbent ratings (4.8★) keeps it on the watch list.
Flapen Score
Top 43% of 811 Automotive niches · +1 vs the category median of 49
Is 5w40 Engine Oil profitable on Amazon?
According to Flapen's Amazon United Kingdom niche tracking, 5w40 Engine Oil is a £188K/yr Amazon United Kingdom market (119K searches/yr). The top 5 brands hold 93% of demand. Verdict: Worth a look — 50/100.
5w40 Engine Oil: the Amazon niche in one read
Everything a seller checks before entering, in three answers.
Is the demand real?
Worth a look. Search demand moved +19.2% over the last 90 days and 6.8% of searches end in a purchase.
£188K
revenue / yr
Who owns the niche?
The top 5 brands hold 93% of demand, so 7% of the market is open.
7%
open market share
Is there a way in?
Listing quality. The average product page scores 0/100 on content standards. Incumbents average 4.8★ — the gap to enter on.
0/100
page quality · 17 products
Top 5w40 Engine Oil products & what they sell for
Every tracked product — its share of the shelf, its review moat, and what it sells for.
Top sellers
by 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
90-day click momentumCastrol 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: brands, sellers & click share
The top 5 products take 63% of clicks — established leaders, but buyers still shop beyond them.
Brands
8 falling
Sellers
53
Top-5 brand share
93%
Top 20: 100%
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%)
5w40 Engine Oil demand & seasonality
Weekly search volume, with the niche's key stats alongside.
No pronounced peak months · busiest ÷ quietest = 1.4×
Top 5w40 Engine Oil search terms shoppers use
The exact queries shoppers type, with 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
What reviews say buyers love and hate about 5w40 Engine Oil
What buyers mention most, as a share of all reviews.
What buyers love
94% of reviews“Good price”
“Good quality oil”
“Great oil choice”
“As expected”
“Strong, reliable oil for smooth engine performance”
What buyers complain about
79% of reviews“While the price point is a bit higher”
“My car never consumes oil”
“Disappointed happy with the quality”
“This version doesnt seem to have titanium”
“Not really a perfect fit”
5w40 Engine Oil return rate & reasons
Why buyers send it back, as a share of all return requests.
0.6%
Return rate
16%
Fixable by listing
The "fixable" share counts expectation-mismatch reasons — size, look, advertised-vs-actual — that better copy and images address.
Common 5w40 Engine Oil questions
The questions sellers ask about this niche, answered from the tracked metrics.
Related niches
Same-category niches scoring near this one — the next ones worth researching.
Best Flapen score
The highest-scoring niches we track right now, across every category.
