---
title: "Oil Cap — $97K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/oil-cap"
last_updated: "2026-08-06T20:50:12.714Z"
locale: en
meta:
description: "Niche score 53/100 · $97K/yr market · 218K searches/yr · $10.35 avg price. Soft demand (-15.6% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 53/100 · $97K/yr market · 218K searches/yr · $10.35 avg price. Soft demand (-15.6% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Oil Cap — $97K/yr Amazon US Niche (2026) - Flapen"
---
# **oil cap**
**Worth a look**
Shows a fragmented shelf (top 5 take 22% of clicks), but soft demand (-15.6% this quarter) keeps it on the watch list.
Market size 24Growth 17Conversion 52Competition 93Returns 43Price range 37Avg price 36Brand share 79Review moat 91Quality gap 76
**Competition**
**Great****22%**
top-5 click share — an open shelf
**Review moat**
**Great****186.53**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Great****56%**
top-5 brand share — no brand owns this niche
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Good****4.3%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Okay****3.6%**
return rate — above 5% kills the launch gate
**Price range**
**Okay****$5.50–$20.70**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Okay****$10.35**
avg listing price — sweet spot $15–$100
**Market size**
**Bad****$97K**
$97K/yr · 218K searches
**Growth**
**Bad****-15.6%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, oil cap is a $97K/yr Amazon United States market (218K searches/yr). The top 5 brands hold 56% of demand. Verdict: Worth a look — 53/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **oil cap market data**
- **Units sold / yr**
- **10K–13K**
- avg 0–100/product
- **Revenue / yr**
- **$104K–$129K**
- units × avg price
- **Conversion rate**
- **4.3%**
- **Avg BSR**
- **#1,601**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **61%**
- **Out of stock**
- **0.6%**
- **Avg brand age**
- **50 months**
- **Avg seller age**
- **168 days**
## **Competition & brand share**
Clicks spread well past the top 5 (22% combined) — an open shelf where new products get seen.
**Brands**
**37 **▼falling
**Sellers**
**132**
**Top-5 brand share**
**56%**
Top 20: 89%
**Top-5 click share**
**22%**
Top 20: 48%
**Open market**
**39%**
- Manymiba24% - ACDelco12% - KUQUTIDY9% - MotoRad7% - A-Premium5% - Anleecap5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -15.6% search growth over the last 90 days.
5K3K seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/automotive/oil-cap/trend)
## **Top oil cap search terms**
- **oil cap**94K/yr-15.6%3.6% conv. - **oil filler cap**33K/yr-6.3%3.7% conv. - **oil cap replacement**32K/yr-7.8%4.2% conv. - **engine oil cap**15K/yr-19.3%4.0% conv. - **oil fill cap**11K/yr-14.1%3.6% conv. - **tapa de aceite de motor**6K/yr-16.5%1.5% conv. - **oil cap gasket**5K/yr-18.8%2.3% conv. - **engine oil filler cap**5K/yr-13.6%2.8% conv. - **automotive replacement oil filler caps**5K/yr-22.9%2.5% conv. - **engine oil cap replacement**4K/yr-24.9%3.6% conv. [**All search terms **](https://flapen.com/research/us/automotive/oil-cap/search-terms)
## **Top oil cap 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.
0%2%$2K4%$4K6%$6K8%$8K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**KUQUTIDY Engine Oil Filler Cap Replacement Compatible with GM 1992-2018 1994-2011 Chevrolet GMC Cadillac Buick Oldsmobile Pontiac Hummer Saab Isuzu Repalce FC208 12573337**KUQUTIDY**$9.02**3.6★67 rev](https://www.amazon.com/dp/B0FVRQNWQC) [2**Engine Oil Filler Cap for Dodge Ram Jeep Chrysler 1997-2003 Ram 1500 2500 3500 Wrangler Cherokee Caravan Dakota Durango Intrepid Neon Stratus Concorde PT Cruiser 53010654AA 04648831AA**Manymiba**$7.45**4.6★70 rev](https://www.amazon.com/dp/B0F8TTQ6H2) [3**KoiLuvGo Engine Oil Filler Cap Replacement Compatible with GM 1992-2018 1994-2011 Chevrolet GMC Cadillac Buick Oldsmobile Pontiac Hummer Saab Isuzu Replaces OEM #FC208 12573337**KoiLuvGo**$9.07**2.5★15 rev](https://www.amazon.com/dp/B0GHPPXPZW) [4**ACDelco GM Original Equipment FC219 (12589430) Engine Oil Filler Cap**ACDelco**$14.89**4.7★1,414 rev](https://www.amazon.com/dp/B000C9S2J0) [5**ACDelco GM Original Equipment FC208 (12573337) Engine Oil Filler Cap**ACDelco**$10.77**4.7★1,496 rev](https://www.amazon.com/dp/B000C9TTJM)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**KoiLuvGo Engine Oil Filler Cap Replacement Compatible with GM 1992-2018 1994-2011 Chevrolet GMC Cadillac Buick Oldsmobile Pontiac Hummer Saab Isuzu Replaces OEM #FC208 12573337**KoiLuvGo**$9.07**15 rev4mo ago](https://www.amazon.com/dp/B0GHPPXPZW) [**ESWW Engine Oil Filler Cap Replacement Durable Oil Fill Cap for Secure Sealing Leak-Proof Tight Fit Design with Identification Pattern Replaces OEM 06K103485A Compatible with VW Audi**ESWW**$7.16**1 rev6mo ago](https://www.amazon.com/dp/B0GG2YS7SD) [**WZP OD 2/50.8mm Oil Filler Cap Aluminum Alloy Weld Billet On Filler Neck Cap Oil Universal Replacement for Oil Fuel Water Tank (Black)**WZP**$8.32**0 rev6mo ago](https://www.amazon.com/dp/B0G7YMLT1V) [**KUQUTIDY Engine Oil Filler Cap Replacement Compatible with GM 1992-2018 1994-2011 Chevrolet GMC Cadillac Buick Oldsmobile Pontiac Hummer Saab Isuzu Repalce FC208 12573337**KUQUTIDY**$9.02**67 rev9mo ago](https://www.amazon.com/dp/B0FVRQNWQC) [**Engine Oil Filler Cap for Dodge Ram Jeep Chrysler 1997-2003 Ram 1500 2500 3500 Wrangler Cherokee Caravan Dakota Durango Intrepid Neon Stratus Concorde PT Cruiser 53010654AA 04648831AA**Manymiba**$7.45**70 rev1y ago](https://www.amazon.com/dp/B0F8TTQ6H2)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**ESWW Engine Oil Filler Cap Replacement Durable Oil Fill Cap for Secure Sealing Leak-Proof Tight Fit Design with Identification Pattern Replaces OEM 06K103485A Compatible with VW Audi**ESWW**$7.16**1.0★**▲ 221%**](https://www.amazon.com/dp/B0GG2YS7SD) [**KoiLuvGo Engine Oil Filler Cap Replacement Compatible with GM 1992-2018 1994-2011 Chevrolet GMC Cadillac Buick Oldsmobile Pontiac Hummer Saab Isuzu Replaces OEM #FC208 12573337**KoiLuvGo**$9.07**2.5★**▲ 177%**](https://www.amazon.com/dp/B0GHPPXPZW) [**WZP OD 2/50.8mm Oil Filler Cap Aluminum Alloy Weld Billet On Filler Neck Cap Oil Universal Replacement for Oil Fuel Water Tank (Black)**WZP**$8.32**0.0★**▲ 79%**](https://www.amazon.com/dp/B0G7YMLT1V) [**Engine Oil Filler Cap for Dodge Ram Jeep Chrysler 1997-2003 Ram 1500 2500 3500 Wrangler Cherokee Caravan Dakota Durango Intrepid Neon Stratus Concorde PT Cruiser 53010654AA 04648831AA**Manymiba**$7.45**4.6★**▲ 59%**](https://www.amazon.com/dp/B0F8TTQ6H2) [**KUQUTIDY Engine Oil Filler Cap Replacement Compatible with GM 1992-2018 1994-2011 Chevrolet GMC Cadillac Buick Oldsmobile Pontiac Hummer Saab Isuzu Repalce FC208 12573337**KUQUTIDY**$9.02**3.6★**▲ 53%**](https://www.amazon.com/dp/B0FVRQNWQC)
**~~View all trending →~~**
## **What buyers say about oil cap**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**59%
*“Fit my jeep”*
**Quality-Overall**10%
*“Good quality”*
**Advertised Vs Actual Product**7%
*“Works as advertised”*
**Value For Money**6%
*“Good Value”*
**Efficiency**3%
*“Works well”*
**Lubrication**3%
*“The oil cap was decent”*
**Leak-Proof**1%
*“Fixed my oil leak on 09 ford escape 3.0 v6”*
**Design-Overall**1%
*“Works as designed”*
**Assembly/Installation**1%
*“Installation was super easy”*
**Functionality-Overall**1%
*“Item works as described”*
### **What buyers complain about **
**Size-Overall**35%
*“it doesnt fit my Car”*
**Compatibility-Overall**20%
*“Not compatible”*
**Durability**8%
*“fell off after a few of days of driving”*
**Quality-Overall**7%
*“The quality is the part that I am questioning as the part appears to be a little bit smaller on the top part”*
**Advertised Vs Actual Product**5%
*“Inaccurate information”*
**Leak-Proof**3%
*“it had started leaking a mess I didnt think I could find an alternative”*
**Defective Material/Parts**2%
*“Defective part”*
**Jamming/Clogging**1%
*“There is a manufacturers defect in the motor causing the PCV valve to clog”*
**Fastener Quality**1%
*“The cap actually screws in so it doesnt pop off like a cheap plug”*
**Weight Heavy**1%
*“A mere paperweight”*
### **Top return reasons **
**Size-Overall**70%
**Compatibility-Overall**14%
**Advertised Vs Actual Product**6%
**Defective Material/Parts**4%
**Value For Money**2%
**Functionality-Overall**1%
**Assembly/Installation**1%
**Leak-Proof**0%
**Product Condition**0%
**Mechanism Issues**0%
## **Common questions**
- **Is oil cap profitable to sell on Amazon United States?**
- The niche generates $97K/yr across 96 tracked products. 1 of 15 products launched in the last 360 days are still selling. 90-day search growth is -15.6%. Flapen's verdict: Worth a look (53/100).
- **How competitive is the oil cap niche?**
- 37 brands and 132 sellers compete. The top 5 products take 22% of clicks and top 5 brands hold 56% of demand.
- **What do buyers complain about in oil cap?**
- Top complaints mined from reviews: Size-Overall, Compatibility-Overall, Durability. The return rate is 3.6%.
- **When does demand for oil cap peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the oil cap niche?**
- Listings span $5.50–$20.70; the average listing price is $10.35 (sweet spot $15–$100). The average incumbent carries 187 reviews — the moat a new listing must climb.
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