American Oil Wholesale stocks SAE 20W-50 motor oil across eleven brands, thirteen products in all, from Thunder value cases to Mobil Special synthetic blend. Every one of them is a conventional or synthetic blend formulation: unlike our 10W-40 and 5W-30 lineups, the 20W-50 shelf has no full synthetic option at all. One wholesale account at our Hialeah warehouse covers the full range, so a shop can order every 20W-50 SKU on the same invoice as the rest of its fluid program.
This guide lists every 20W-50 product we carry, tier by tier, with pack sizes and a plain note on why the grade still earns shelf space even as most modern engines have moved to thinner factory fills, so auto shop owners, fleet buyers, and Caribbean and Latin American export resellers can order the right one.
What the 20W-50 Designation Means
The two numbers in "20W-50" 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 "20W" is the winter rating: it caps cold-cranking viscosity at a maximum 9,500 mPa·s at -15°C and pumping viscosity at a maximum 60,000 mPa·s at -20°C, a looser cold-start limit than the 5W and 10W ratings that cover most of our other grades. The "50" is the hottest running grade in our whole passenger-car engine oil catalog: a kinematic viscosity window of 16.3 to under 21.9 mm²/s at 100°C, thicker at operating temperature than every 30-grade or 40-grade oil we stock. The winter number and the hot number are set independently, so 20W-50 is built for warm, already-running service rather than sub-zero cold starts.
House Brand Tier: American Oil and Thunder
American Oil, our private-label house line, skips the case at this grade and ships its single 20W-50 formulation, a synthetic blend, by the 55-gallon drum and 275-gallon tote. Thunder, our value workhorse brand, covers 20W-50 in conventional and synthetic blend, both in the same 12/1-quart case format; Thunder's 20W-50 line stops at synthetic blend, it does not extend to the full synthetic tier the way Thunder's 10W-40 line does.
| Product | Formulation | Pack Sizes | Best For |
|---|---|---|---|
| American Oil Synthetic Blend Motor Oil SAE 20W-50 | Synthetic Blend | 55 Gal, 275 Gal | Bay-side bulk dispensing |
| Thunder Conventional Motor Oil SAE 20W-50 | Conventional | 12/1 Qt | Entry-level ticket price |
| Thunder Plus Synthetic Blend Motor Oil SAE 20W-50 | Synthetic Blend | 12/1 Qt | Mid-tier upsell |
Featured Brand Tier: Prime Guard, Super S, and Starfire
Prime Guard carries the widest 20W-50 pack spread of any brand we stock, case through tote. Super S and Starfire each carry a single synthetic blend 20W-50 line.
| Product | Formulation | Pack Sizes | Best For |
|---|---|---|---|
| Prime Guard Conventional Motor Oil SAE 20W-50 | Conventional | 12/1 Qt, 3/5 Qt, 55 Gal, 275 Gal | Case-to-tote brand consistency |
| Super S Multi-Flo Synthetic Blend Motor Oil SAE 20W-50 | Synthetic Blend | 12/1 Qt, 55 Gal, 275 Gal | Brand already recognized across the Caribbean |
| Starfire Synthetic Blend Motor Oil SAE 20W-50 | Synthetic Blend | 12/1 Qt | Value-priced modern spec |
National Brand Tier: Mobil, Chevron, and Castrol
Mobil, Chevron, and Castrol each carry one 20W-50 formulation, and all three ship in case format with drum and tote options behind it.
| Product | Formulation | Pack Sizes | Best For |
|---|---|---|---|
| Mobil Special Synthetic Blend Motor Oil SAE 20W-50 | Synthetic Blend | 6/1 Qt, 3/5 Qt, 55 Gal, 275 Gal | Entry Mobil tier |
| Chevron Supreme Conventional Motor Oil SAE 20W-50 | Conventional | 12/1 Qt, 55 Gal, 275 Gal | Chevron-brand passenger car work |
| Castrol GTX Conventional Motor Oil SAE 20W-50 | Conventional | 6/1 Qt, 3/5 Qt, 55 Gal, 275 Gal | Classic and high-mileage service tickets |
Zero Full Synthetic: Why We Don't Stock One
Of the thirteen 20W-50 products on our shelf, across all eleven brands, not one carries a full synthetic label. Compare that to our 10W-40 lineup, where Thunder alone offers a full synthetic option: the demand for this specific grade in our market skews toward conventional and synthetic blend chemistry, priced for the older and higher-mileage engines that still call for it, not the fuel-economy-focused full synthetics built for modern factory-fill viscosities. A shop stocking 20W-50 for general service work has thirteen conventional and synthetic blend SKUs to choose from across every price tier we carry.
Value and Specialty Tier: TekStar, Xcel, and CAM2
TekStar covers 20W-50 in both a standard formula and an ILSAC GF-6 synthetic blend, each available by the drum and tote. Xcel and CAM2 round out the tier.
| Product | Formulation | Pack Sizes | Best For |
|---|---|---|---|
| TekStar Auto Motor Oil SAE 20W-50 | Standard formula | 12/1 Qt, 55 Gal, 275 Gal | Lowest entry price point |
| TekStar Syn-Blend GF-6 Motor Oil SAE 20W-50 | Synthetic Blend, ILSAC GF-6 | 12/1 Qt, 55 Gal, 275 Gal | Current ILSAC GF-6 spec |
| Xcel Premium Motor Oil SAE 20W-50 | Standard formula | 12/1 Qt | Sharpest price point |
| CAM2 Synthetic Blend Super/Pro Max Motor Oil SAE 20W-50 | Synthetic Blend | 12/1 Qt, 55 Gal, 275 Gal | Value blend, case-to-drum |
Why 20W-50 Still Earns Shelf Space
20W-50 is not a leftover grade we keep around out of habit. Its "50" kinematic viscosity window, 16.3 to under 21.9 mm²/s at 100°C, is the thickest hot-running film of anything in our engine oil catalog, and that extra body is exactly what an older engine with worn bearing clearances or an engine running hot under load needs to hold oil pressure. Castrol markets its own GTX 20W-50 line under a "Classic and High Mileage" banner, positioning the grade squarely for older and higher-mileage service rather than new-vehicle factory fills (Castrol, GTX 20W-50 product page). For Caribbean and Latin American export buyers stocking an older or mixed-age vehicle park in a hot climate, 20W-50 is a standing service-fill choice, not a legacy holdover, and it ships on the same EXW Miami export program as the rest of our engine oil catalog.
Buying 20W-50 Wholesale, by the Case, Drum, or Tote
Every SKU on this page ships from our Hialeah warehouse on the same invoice as the rest of your fluid order: coolant, ATF, DEF, gear oil, and brake fluid. Auto 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 20W-50 order rides with the rest of your fluids, and C.O.D. terms let a new account start simple.
If your ticket mix runs older or higher-mileage vehicles in volume, the American Oil, Prime Guard, Super S, Mobil, Chevron, Castrol, TekStar, and CAM2 drum and tote formats let you pump 20W-50 directly instead of breaking case after case. A single 275-gallon tote holds roughly the same volume as 55 five-gallon pails, so a shop or exporter running steady 20W-50 volume receives and stores one unit instead of dozens of smaller ones.
Stock the Grade, Confirm the Application
20W-50 on our shelf runs entirely conventional and synthetic blend, priced and packaged for the older and higher-mileage engines that still specify it. Request a wholesale quote to confirm current availability by formulation and pack size, and add it to the same account as the rest of your fluid program.