--- title: "delo 15w40 diesel oil — Niche Verdict: Skip it (42/100) | Amazon United States - Flapen" canonical_url: "https://flapen.com/amazon/research/us/automotive/delo-15w40-diesel-oil" last_updated: "2026-07-10T01:52:03.250Z" locale: en meta: description: "a small market ($35K/yr) — delo 15w40 diesel oil doesn't clear our bar today." "og:description": "a small market ($35K/yr) — delo 15w40 diesel oil doesn't clear our bar today." "og:title": "delo 15w40 diesel oil — Niche Verdict: Skip it (42/100) | Amazon United States - Flapen" --- Back to Flapen home # **delo 15w40 diesel oil** **Skip it****42/100 ** a small market ($35K/yr) — delo 15w40 diesel oil doesn't clear our bar today. **Market/yr** **$35K** **Growth (1y)** **+121.5%** **Products** **21** **Brands** **6** was 4 a year ago **Sellers** **94** **Price range** **$14.75–$137.94** **Returns** **0.5%** **Rating** **4.6★** **Skip it** Scored 42/100 across market size, growth, competition, quality gap, and returns. Market sizeGrowthCompetitionQuality gapReturns Market size **2** ×0.30 Growth **68** ×0.30 Competition **44** ×0.20 Quality gap **30** ×0.10 Returns **96** ×0.10 ## **Demand** Weekly Amazon search volume, last 84 weeks — +121.5% year over year. 1K524Spike '25Prime Day '25Spike '26Dec '24Mar '25Jun '25Sep '25Dec '25Apr '26 ## **Seasonality** Monthly demand index across the year — 1.00 is average. JFMAMJJASOND No pronounced peak months · busiest ÷ quietest = 1.5× ## **Competition** - Chevron59% - Warren Distribution21% - Shell Rotella10% - Valvoline7% - Generic1% - Delo1% - Other0% The top 5 products take 61% of clicks — established leaders, but buyers still shop beyond them. 6 brands and 94 sellers compete here. **Brands** **6 **▲rising was 4 a year ago **Sellers** **94** **Top 5 brand share** **99%** #ProductBrandPriceRatingReviewsClick shareTrend 1 ![Delo GAL 15W40 HD Oil3](https://m.media-amazon.com/images/I/41oVAmxxGqL.jpg) [**Delo GAL 15W40 HD Oil3**](https://www.amazon.com/dp/B00GXEXPHW) Warren Distribution$127.813.0★121%▲rising 2 ![Chevron Delo 400 XLE SAE Synblend Synthetic Blend Oil 15W40 1 Gallon Case of 3](https://m.media-amazon.com/images/I/51+U1KrQlNL.jpg) [**Chevron Delo 400 XLE SAE Synblend Synthetic Blend Oil 15W40 1 Gallon Case of 3**](https://www.amazon.com/dp/B07L1P227J) Chevron$46.164.7★1,11515%▼falling 3 ![Delo 400 XLE Heavy Duty Synblend Diesel Engine Oil 15W-40 1 Gallon Pack of 1](https://m.media-amazon.com/images/I/41ei53kAtHL.jpg) [**Delo 400 XLE Heavy Duty Synblend Diesel Engine Oil 15W-40 1 Gallon Pack of 1**](https://www.amazon.com/dp/B07L1F876S) Chevron$14.754.7★1,1159%▼falling 4 ![Delo 222290465 400 XLE Synthetic Blend 15W-40 Motor Oil - 5 Gallon Pail](https://m.media-amazon.com/images/I/41U+jIMHD0L.jpg) [**Delo 222290465 400 XLE Synthetic Blend 15W-40 Motor Oil - 5 Gallon Pail**](https://www.amazon.com/dp/B0D4G5YTSM) Chevron$101.364.7★1,1158%▼falling 5 ![Chevron Delo 222290465 400 SDE SAE 15W-40 Motor Oil - 5 Gallon Pail](https://m.media-amazon.com/images/I/51dfGrt9oOL.jpg) [**Chevron Delo 222290465 400 SDE SAE 15W-40 Motor Oil - 5 Gallon Pail**](https://www.amazon.com/dp/B0097SBCCG) Chevron$119.024.5★1058%▲rising 6 ![Chevron Delo 400 XLE SAE Synblend Synthetic Blend Diesel Oil 15W40 1 Quart Case of 12](https://m.media-amazon.com/images/I/41YBwgcE87L.jpg) [**Chevron Delo 400 XLE SAE Synblend Synthetic Blend Diesel Oil 15W40 1 Quart Case of 12**](https://www.amazon.com/dp/B0D4N6QMFM) Chevron$81.534.7★1,1156%▲rising 7 ![Delo 400 SDE SAE Conventional Heavy Duty Diesel Engine Oil 15W-40 1 Gallon Pack of 3](https://m.media-amazon.com/images/I/515fXIbWjKL.jpg) [**Delo 400 SDE SAE Conventional Heavy Duty Diesel Engine Oil 15W-40 1 Gallon Pack of 3**](https://www.amazon.com/dp/B0098VFTCQ) Chevron$74.904.6★8886%▲rising 8 ![Chevron Delo 400 SDE SAE 15W-40 Motor Oil - 1 Quart Bottle](https://m.media-amazon.com/images/I/41iasQf7xzL.jpg) [**Chevron Delo 400 SDE SAE 15W-40 Motor Oil - 1 Quart Bottle**](https://www.amazon.com/dp/B001DKPBVO) Chevron$19.574.4★463%▲rising 9 ![Shell Rotella T4 Triple Protection 15W-40 Diesel Engine Oil 1 Gallon](https://m.media-amazon.com/images/I/41WrazgRjOL.jpg) [**Shell Rotella T4 Triple Protection 15W-40 Diesel Engine Oil 1 Gallon**](https://www.amazon.com/dp/B01LH7L0XA) Shell Rotella$15.734.7★1,6233%▲rising 10 ![Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil 1 Gallon (3 Pack)](https://m.media-amazon.com/images/I/51S6Qm9kZfL.jpg) [**Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil 1 Gallon (3 Pack)**](https://www.amazon.com/dp/B07PSVLF6G) Shell Rotella$68.214.7★3,2513%▲rising 11 ![Delo 400 SNG 15W40 Natural Gas Motor Oil 1 gal Pack of 1](https://m.media-amazon.com/images/I/41pUaGjlMqL.jpg) [**Delo 400 SNG 15W40 Natural Gas Motor Oil 1 gal Pack of 1**](https://www.amazon.com/dp/B0D4FG8NH5) Chevron$32.655.0★12%▲rising 12 ![Valvoline Premium Blue One Solution SAE 15W-40 Diesel Engine Oil 1 GA](https://m.media-amazon.com/images/I/41IGNhYNCyL.jpg) [**Valvoline Premium Blue One Solution SAE 15W-40 Diesel Engine Oil 1 GA**](https://www.amazon.com/dp/B000GAP43W) Valvoline$23.284.8★1,4652%▲rising 13 ![Valvoline Heavy Duty Synthetic Blend 15W-40 Diesel Engine Oil 1 GA Case of 3](https://m.media-amazon.com/images/I/41Cp5k29BYL.jpg) [**Valvoline Heavy Duty Synthetic Blend 15W-40 Diesel Engine Oil 1 GA Case of 3**](https://www.amazon.com/dp/B0FBRLZX8Z) Valvoline$52.474.8★1492%▲rising 14 ![Delo 400 SAE 40 Motor Oil 1 Gallon Jug](https://m.media-amazon.com/images/I/51Nmlr1yM6L.jpg) [**Delo 400 SAE 40 Motor Oil 1 Gallon Jug**](https://www.amazon.com/dp/B001448W2E) Chevron$30.784.5★692%▲rising 15 ![Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil 1 Gallon](https://m.media-amazon.com/images/I/41X-NocmDSL.jpg) [**Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil 1 Gallon**](https://www.amazon.com/dp/B01LG3Q5RG) Shell Rotella$20.034.8★4,4152%▲rising **~~Showing 15 of 21 — show all ~~** ## **Product shelf** All 21 tracked products in this niche. Top sellersNewestTrending [![Delo GAL 15W40 HD Oil3](https://m.media-amazon.com/images/I/41oVAmxxGqL.jpg)**Delo GAL 15W40 HD Oil3** Warren Distribution**$127.81**3.0★1 reviews](https://www.amazon.com/dp/B00GXEXPHW) [![Chevron Delo 400 XLE SAE Synblend Synthetic Blend Oil 15W40 1 Gallon Case of 3](https://m.media-amazon.com/images/I/51+U1KrQlNL.jpg)**Chevron Delo 400 XLE SAE Synblend Synthetic Blend Oil 15W40 1 Gallon Case of 3** Chevron**$46.16**4.7★1,115 reviews](https://www.amazon.com/dp/B07L1P227J) [![Delo 400 XLE Heavy Duty Synblend Diesel Engine Oil 15W-40 1 Gallon Pack of 1](https://m.media-amazon.com/images/I/41ei53kAtHL.jpg)**Delo 400 XLE Heavy Duty Synblend Diesel Engine Oil 15W-40 1 Gallon Pack of 1** Chevron**$14.75**4.7★1,115 reviews](https://www.amazon.com/dp/B07L1F876S) [![Delo 222290465 400 XLE Synthetic Blend 15W-40 Motor Oil - 5 Gallon Pail](https://m.media-amazon.com/images/I/41U+jIMHD0L.jpg)**Delo 222290465 400 XLE Synthetic Blend 15W-40 Motor Oil - 5 Gallon Pail** Chevron**$101.36**4.7★1,115 reviews](https://www.amazon.com/dp/B0D4G5YTSM) [![Chevron Delo 222290465 400 SDE SAE 15W-40 Motor Oil - 5 Gallon Pail](https://m.media-amazon.com/images/I/51dfGrt9oOL.jpg)**Chevron Delo 222290465 400 SDE SAE 15W-40 Motor Oil - 5 Gallon Pail** Chevron**$119.02**4.5★105 reviews](https://www.amazon.com/dp/B0097SBCCG) [![Chevron Delo 400 XLE SAE Synblend Synthetic Blend Diesel Oil 15W40 1 Quart Case of 12](https://m.media-amazon.com/images/I/41YBwgcE87L.jpg)**Chevron Delo 400 XLE SAE Synblend Synthetic Blend Diesel Oil 15W40 1 Quart Case of 12** Chevron**$81.53**4.7★1,115 reviews](https://www.amazon.com/dp/B0D4N6QMFM) [![Delo 400 SDE SAE Conventional Heavy Duty Diesel Engine Oil 15W-40 1 Gallon Pack of 3](https://m.media-amazon.com/images/I/515fXIbWjKL.jpg)**Delo 400 SDE SAE Conventional Heavy Duty Diesel Engine Oil 15W-40 1 Gallon Pack of 3** Chevron**$74.90**4.6★888 reviews](https://www.amazon.com/dp/B0098VFTCQ) [![Chevron Delo 400 SDE SAE 15W-40 Motor Oil - 1 Quart Bottle](https://m.media-amazon.com/images/I/41iasQf7xzL.jpg)**Chevron Delo 400 SDE SAE 15W-40 Motor Oil - 1 Quart Bottle** Chevron**$19.57**4.4★46 reviews](https://www.amazon.com/dp/B001DKPBVO) ## **Reviews** What buyers praise and complain about, mined from review topics. ### **What buyers love ** **Value For Money**40% *“Great Value”* **Lubrication**23% *“The best oil for my truck”* **Quality-Overall**18% *“Quality product”* **Advertised Vs Actual Product**6% *“Accurate description”* **Motor Power**3% *“diesel motors works well in my Chevy gas motor”* **Fuel Efficiency**3% *“Engine runs great”* **Efficiency**1% *“Works okay”* **Friction**1% *“lifters survive the extreme friction”* **Size-Overall**1% *“Perfect size for 93 f250 7.3 oil change”* **Leak-Proof**1% *“No leaks”* ### **What buyers complain about ** **Leak-Proof**40% *“Gallon containers was leaking when I received them”* **Value For Money**12% *“expensive now”* **Lubrication**10% *“If you need to change your oil urgently you should probably no go with this product”* **Filtration**7% *“Poor fuel filters”* **Quality-Overall**3% *“Not the best”* **Ethical Trade/Fair Trade**2% *“Unethical seller”* **Advertised Vs Actual Product**2% *“This unfortunately is attributed to a LISTING ERROR”* **Product Condition**2% *“JUST RETIRED”* #### **Top return reasons**- Leak-Proof50% - Lubrication12% - Compatibility-Overall9% - Advertised Vs Actual Product9% - Value For Money7% - Defective Material/Parts3% - Material Quality2% - Size-Overall2% - Maintenance And Repair1% - Functionality-Overall1%