American Oil Wholesale stocks SAE 15W-40 heavy-duty diesel motor oil across twelve brands, twenty-one products in all, from Mobil Delvac and Shell Rotella cases to our own American Oil drum and tote fills. Two of those twenty-one carry a full synthetic label. Nine carry the current API CK-4 heavy-duty diesel license by name, three carry the older CI-4 designation, and the remaining nine don't list an API category on the product name at all. One wholesale account at our Hialeah warehouse covers the full range, so a fleet or diesel shop can order every 15W-40 SKU on the same invoice as the rest of its fluid program.
This guide lists every 15W-40 product we carry, tier by tier, with pack sizes and, where the catalog lists one, the API category on the label, so fleet buyers, diesel shop operators, and Caribbean and Latin American export resellers can order the right one.
What SAE 15W-40 Means for Diesel Engines
The two numbers in "15W-40" are independent limits set by SAE International's SAE J300 engine oil viscosity classification, the standard the industry uses to define multigrade oil (SAE International, SAE J300). The "15W" is the winter rating: it caps cold-cranking viscosity at a maximum 7,000 mPa·s at -20°C and pumping viscosity at a maximum 60,000 mPa·s at -25°C. The "40" is the hot-running grade: a kinematic viscosity window of 12.5 to under 16.3 mm²/s at 100°C, one step thicker than the 30-grade oils that cover most of our passenger-car lineup. 15W-40 has been the default viscosity for on-highway and off-road heavy-duty diesel engines for decades, and it is the deepest single grade in our heavy-duty diesel catalog.
House Brand Tier: American Oil and Thunder
American Oil, our private-label house line, covers 15W-40 at both ends of the spectrum: a full synthetic CK-4 formulation in drum and tote only, and a standard-formula CK-4 line that adds a 5-gallon pail. Thunder, our value workhorse brand, carries 15W-40 as a synthetic blend in the 5-gallon pail size.
| Product | Formulation | Pack Sizes | Best For |
|---|---|---|---|
| American Oil Full Synthetic Motor Oil CK-4 SAE 15W-40 | Full Synthetic | 55 Gal, 275 Gal | Drum and tote fill for extended-interval fleets |
| American Oil Heavy Duty Motor Oil CK-4 SAE 15W-40 | Standard formula | 5 Gal, 55 Gal, 275 Gal | House-brand pail-to-tote coverage |
| Thunder Plus Synthetic Blend Motor Oil CK-4 SAE 15W-40 | Synthetic Blend | 5 Gal | Value-brand synthetic blend pail |
National Brand Tier: Mobil, Shell, Chevron, Valvoline, and Motorcraft
Mobil, Shell, Chevron, Valvoline, and Ford Motorcraft together carry eleven of our twenty-one 15W-40 products, the deepest coverage of any brand tier on our shelf. Shell's Rotella line alone spans three formulations, from the conventional-labeled T4 through the full synthetic T6.
| Product | Formulation | Pack Sizes | Best For |
|---|---|---|---|
| Mobil Delvac 1300 Super Heavy Duty Motor Oil CK-4 SAE 15W-40 | Standard formula | 6/1 Qt, 4/1 Gal, 5 Gal, 55 Gal, 275 Gal | Widest Delvac pack spread, case through tote |
| Mobil Delvac Heavy Duty Motor Oil CK-4 SAE 15W-40 | Standard formula | 5 Gal | Delvac entry pail |
| Shell Rimula Diesel Engine Oil SAE 15W-40 | Standard formula | 5 Gal | Rimula pail fill |
| Shell Rotella T4 Conventional Motor Oil CK-4 SAE 15W-40 | Conventional | 6/1 Qt, 3/1 Gal, 5 Gal, 55 Gal, 275 Gal | The volume Rotella line, case through tote |
| Shell Rotella T5 Synthetic Blend Motor Oil SAE 15W-40 | Synthetic Blend | 3/1 Gal | Mid-tier Rotella upgrade |
| Shell Rotella T6 Full Synthetic Motor Oil CK-4 SAE 15W-40 | Full Synthetic | 3/1 Gal | Full-synthetic Rotella flagship |
| Chevron Delo 400 Heavy Duty Motor Oil SAE 15W-40 | Standard formula | 3/1 Gal, 5 Gal, 55 Gal, 275 Gal | Widest Delo pack spread, case through tote |
| Chevron Ursa Heavy Duty Motor Oil SAE 15W-40 | Standard formula | 5 Gal | Delo alternative pail |
| Chevron XLE Heavy Duty Motor Oil SAE 15W-40 | Standard formula | 5 Gal | Extended-life Chevron pail |
| Valvoline Premium Blue Heavy Duty Motor Oil SAE 15W-40 | Standard formula | 3/1 Gal, 5 Gal | Cummins-developed formulation |
| Motorcraft Super Duty Diesel Motor Oil SAE 15W-40 | Standard formula | 12/1 Qt, 3/5 Qt | Ford-spec Super Duty diesel case |
No Featured-Brand 15W-40: Prime Guard, Super S, and Starfire
Unlike our lighter passenger-car grades, none of our three featured distributed brands, Prime Guard, Super S, or Starfire, carries a 15W-40 heavy-duty diesel product. Coverage at this grade comes entirely from our house lines and the national and value brands on this page.
Value and Specialty Tier: Allfleet, TekStar, Xcel, Custom Plus, and Sash
Allfleet, TekStar, Xcel, Custom Plus, and Sash round out the grade with seven products between them, the widest brand spread of the value tier. TekStar alone offers three: a standard formula, a synthetic blend upgrade, and a tote-only value fill under its MG line.
| Product | Formulation | Pack Sizes | Best For |
|---|---|---|---|
| Allfleet Synthetic Blend Motor Oil CK-4/SN SAE 15W-40 | Synthetic Blend | 4/1 Gal | Gallon-case fill for trucks and off-road equipment |
| TekStar High Performance Conventional Motor Oil CI-4/SL SAE 15W-40 | Conventional | 12/1 Qt | Sharpest case price point |
| TekStar LE Synthetic Blend Motor Oil CK-4/SN SAE 15W-40 | Synthetic Blend | 12/1 Qt | Current-spec case upgrade |
| TekStar MG Heavy Duty Diesel Motor Oil CI-4 SAE 15W-40 | Standard formula | 275 Gal | Tote-only value fill |
| Xcel Super Duty Motor Oil SAE 15W-40 | Standard formula | 12/1 Qt | Value case pricing |
| Custom Plus Turbo HD Synthetic Blend Motor Oil CI-4/SL SAE 15W-40 | Synthetic Blend | 12/1 Qt | Synthetic blend case at a value price |
| Sash Master Ultra THPD Conventional Motor Oil SAE 15W-40 | Conventional | 5 Gal | Value conventional pail |
Two Full Synthetic Options: American Oil and Shell Rotella T6
Of the twenty-one 15W-40 products on our shelf, across all twelve brands, only two carry a full synthetic label: American Oil's house-brand CK-4 full synthetic and Shell's Rotella T6 CK-4 full synthetic. Both trade the standard-formula and synthetic blend chemistry that fills the rest of the grade for a fully synthetic base oil, which typically holds up longer under sustained high load. The other nineteen products span standard-formula and synthetic blend chemistry, priced for fleets and shops that change diesel oil on a fixed calendar or mileage interval.
CK-4 and the Older CI-4 Spec: Confirm Before You Order
Nine of the twenty-one products on this page carry the API CK-4 category by name, the current top-tier heavy-duty diesel oil license introduced in 2016 and backward-compatible with the older CJ-4, CI-4, and CH-4 categories it replaced (API, Engine Oil Categories). Three products, TekStar High Performance, TekStar MG, and Custom Plus Turbo HD, carry the earlier CI-4 designation instead. CI-4 predates the 2016 CK-4 transition, and a CI-4-only oil is not a substitute where an engine's owner's manual or OEM service bulletin calls for CK-4. The remaining nine products on this page, including long-standing lines like Shell Rimula, Chevron Delo 400, and Valvoline Premium Blue, don't list an API category on the product name; confirm current licensing with your rep at time of order. Always confirm which category your fleet's engines specify, and use a CK-4-licensed product on this page when in doubt.
Buying 15W-40 Wholesale, by the Case, Pail, Drum, or Tote
Every SKU on this page ships from our Hialeah warehouse on the same invoice as the rest of your fluid order: DEF, coolant, gear oil, and grease. Fleets and diesel shops across Miami-Dade get next-day delivery, and Broward and Palm Beach ride the next scheduled route day. The $250 domestic minimum is easy to clear once a 15W-40 order rides with the rest of your fluids, and C.O.D. terms let a new account start simple.
If your shop or fleet runs 15W-40 in volume, the American Oil, Mobil, Shell, Chevron, and TekStar drum and tote formats let you pump it directly instead of breaking case after case. A single 275-gallon tote holds roughly the same volume as 55 five-gallon pails, so a fleet running steady 15W-40 volume receives and stores one unit instead of dozens of smaller ones.
Stock the Grade, Confirm the Spec
15W-40 on our shelf runs from standard-formula and synthetic blend through two full synthetic options. Nine carry the current API CK-4 license by name, three carry the older CI-4 designation, and nine don't list an API category on the product name. Request a wholesale quote to confirm current availability by formulation, API category, and pack size, and add it to the same account as the rest of your fluid program.