The best synthetic oil for a Ram 1500 5.7L HEMI starts with the oil specification for the exact truck. Our shortlist pairs two full-synthetic product lines with two distinct viscosity requirements: Pennzoil Ultra Platinum and Mobil Full Synthetic, each in 5W-20 and 0W-20. Choose the correct branch first, then compare the quantity you actually need.
Scope: The recommendations below are checked against US owner’s manuals for the 2020 and 2024 Ram 1500 DT and Ram 1500 Classic, with the 5.7L HEMI gasoline engine. They are not a specification for every HEMI year, every market or another engine. If your truck is a different year, has an engine replacement, or its oil cap conflicts with its manual, confirm the correct requirement with Ram before ordering.
First match the model year and engine
| Verified truck | 5.7L oil requirement | With filter |
|---|---|---|
| 2020 Ram 1500 DT | SAE 5W-20, API certified, meeting MS-6395; synthetic is permitted when these requirements and service intervals are met | 7 US qt / 6.6 L |
| 2020 Ram 1500 Classic | SAE 5W-20, API certified, meeting MS-6395; synthetic is permitted under the manual’s conditions | 7 US qt / 6.6 L |
| 2024 Ram 1500 DT | Full-synthetic SAE 0W-20, meeting MS-6395, with the API Starburst trademark | 7 US qt / 6.6 L |
| 2024 Ram 1500 Classic | Full-synthetic SAE 0W-20, meeting MS-6395, with the API Starburst trademark | 7 US qt / 6.6 L |
Sources: 2020 DT manual, pages 272 and 310–311; 2020 Classic manual, pages 249 and 290–291; 2024 DT manual, pages 345 and 396–397; 2024 Classic manual, pages 221 and 264. These are exact-year examples, not a claim about the changeover year. Do not apply the 3.6L, diesel or 6.2L TRX entries to a 5.7L HEMI.
The four picks at a glance
| Exact oil and pack | Best fit here | Main tradeoff |
|---|---|---|
| Pennzoil Ultra Platinum 5W-20, 3 × 5 qt | Buying ahead for the covered 2020 5.7L trucks | 15 qt requires more spending and storage than a single service needs |
| Mobil Full Synthetic 5W-20, 1 × 5 qt | A smaller-pack alternative for the covered 2020 5.7L trucks | Needs another 2 qt for a 7-qt service |
| Pennzoil Ultra Platinum 0W-20, 3 × 5 qt | Buying ahead for the covered 2024 5.7L trucks | Bulk quantity; its long-distance marketing does not change Ram’s service schedule |
| Mobil Full Synthetic 0W-20, 1 × 5 qt | A smaller-pack alternative for the covered 2024 5.7L trucks | Needs another 2 qt; check the exact Full Synthetic line and viscosity |
These are buying recommendations based on the documented specification and pack size, rather than a claimed engine-wear contest. The manufacturers’ current information lists MS-6395, API SQ Resource Conserving and ILSAC GF-7A for the selected viscosities. Those are separate checks from the viscosity itself. Inspect the bottle’s API certification mark and label before use.
1. Pennzoil Ultra Platinum Full Synthetic 5W-20: the bulk 5W-20 pick
For the covered 2020 trucks, this is a straightforward option if you want oil for more than one service. Pennzoil’s US 5W-20 technical data sheet lists the required MS-6395 standard alongside API SQ Resource Conserving and ILSAC GF-7A. Select Ultra Platinum 5W-20, three 5-quart jugs; other Pennzoil lines and grades are separate products.
Pennzoil Ultra Platinum Full Synthetic 5W-20 Motor Oil, 5 Quart (3 Pack)
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Why choose it: The 15-quart package covers two 7-quart oil-and-filter fills, with 1 quart left over. It is convenient for an owner who already knows this viscosity is right and has suitable storage.
Keep in mind: A three-pack is more oil than one change needs. Compare the total delivered price with buying 7 quarts locally; a larger package does not automatically mean a lower cost per service. Follow Ram’s schedule even when the bottle advertises a longer protection distance.
2. Mobil Full Synthetic 5W-20: the smaller-pack 5W-20 alternative
Mobil Full Synthetic 5W-20 is a practical alternative for the same covered 2020 5.7L applications. ExxonMobil’s current specification table explicitly lists MS-6395, API SQ Resource Conserving and ILSAC GF-7A for this viscosity. This is Mobil Full Synthetic; do not treat the similar-looking Mobil 1 or high-mileage names as the same selection.
Why choose it: A single 5-quart jug makes sense when you prefer to buy a smaller amount and choose the remaining 2 quarts separately. Use the manufacturer’s product page and buying links to match the exact line and grade.
Keep in mind: One jug is not a complete fill for the trucks covered here. Include the additional oil and a vehicle-matched filter when comparing the service cost. The current technical table is more useful than relying on an old retailer image or an extended-mileage headline.
3. Pennzoil Ultra Platinum Full Synthetic 0W-20: the bulk 0W-20 pick
For the covered 2024 DT and Classic 5.7L trucks, choose Ultra Platinum 0W-20, three 5-quart jugs. Pennzoil’s US 0W-20 technical data sheet lists MS-6395, API SQ Resource Conserving and ILSAC GF-7A. The different winter grade is an intentional model-year match, not a blanket instruction to substitute 0W-20 into every older HEMI.
Why choose it: The same 15-quart arithmetic suits owners buying for two scheduled 7-quart services. The product and pack are clearly identified, making it easier to avoid accidentally selecting the 0W-40 variant.
Keep in mind: Check the quantity at checkout: one order of this pack means three jugs. Keep the remainder securely closed and follow the oil maker’s storage guidance. Neither the full-synthetic label nor a 20,000-mile protection claim authorizes a 20,000-mile interval in your Ram.
4. Mobil Full Synthetic 0W-20: the smaller-pack 0W-20 alternative
Mobil Full Synthetic 0W-20 is the corresponding option for the covered 2024 5.7L trucks. ExxonMobil lists this exact viscosity as meeting or exceeding MS-6395, API SQ Resource Conserving and ILSAC GF-7A. Select the single 5-quart jug when comparing pack sizes.
Why choose it: It lets you plan a one-service purchase without committing to three large jugs. The manufacturer publishes the grade-specific specifications and provides routes to retailers.
Keep in mind: You still need 2 more quarts for the stated 7-quart fill. Verify the label on the oil supplied, because packaging photos can lag behind a formulation or certification update. Choose by the exact product name, viscosity, required standard and API mark together.
How to buy the right oil without overspending
Check three things on the label
Start with the SAE viscosity in the exact engine entry of your owner’s manual. Then check MS-6395 and the required API certification mark. “Full synthetic,” a familiar brand name or an attractive price cannot replace those checks. The API Motor Oil Guide explains that newer gasoline-oil categories cover earlier performance categories; that backward compatibility does not let you ignore the vehicle’s viscosity or manufacturer standard.
Price the complete service
For these four verified 5.7L applications, compare the cost of 7 quarts plus the correct filter. A 5-quart jug can look cheaper while leaving part of the job unpurchased. Conversely, three 5-quart jugs tie up money and storage even though two fills use only 14 quarts. Confirm US quarts rather than assuming a 5-liter bottle is identical.
Keep the vehicle’s maintenance schedule
Use the oil-change indicator and the limits in the matching manual, including any severe-duty instructions for how the truck is driven. Towing, short trips and prolonged idling deserve attention to that schedule. Replace the filter when the manual requires it and check oil level as directed. Do not turn a bottle or filter’s maximum-distance claim into a new service interval.
Avoid the wrong kind of “oil”
Gear lubricant, automatic transmission fluid, coolant, fuel cleaner and oil filters are not substitutes for engine oil. A thicker viscosity or an added lifter treatment is also not a documented repair for a noise. The covered Ram manuals discourage supplemental oil additives except leak-detection dyes and advise dealer inspection when ticking persists or the malfunction indicator light appears.
Which one should you buy?
For a verified 2020 DT or Classic 5.7L, start with the 5W-20 pair. For a verified 2024 DT or Classic 5.7L, start with the 0W-20 pair. Pick the Pennzoil three-pack if buying ahead is useful; pick the Mobil single-jug route if you prefer a smaller purchase and will add the remaining 2 quarts. With the required specification matched, the practical decision is pack size and complete-service cost.
Frequently asked questions
Does every Ram 1500 5.7L HEMI use 5W-20?
No. The verified US 2020 Ram 1500 DT and Classic manuals specify SAE 5W-20 for the 5.7L HEMI, while the verified 2024 manuals specify full-synthetic SAE 0W-20. Match your exact model year, platform and engine before buying.
How much oil do the covered 5.7L engines take?
The four manuals covered here list 7 US quarts, or 6.6 liters, with the oil filter. One 5-quart jug is short by 2 quarts. Follow the manual when filling and checking the dipstick; do not assume another engine has the same capacity.
Can I use 5W-30 instead because it meets MS-6395?
MS-6395 alone does not establish the correct viscosity. The covered 5.7L applications specify either 5W-20 or 0W-20. Follow the exact engine entry in your manual instead of borrowing an alternative listed for a different engine.
Does full-synthetic oil let me extend the Ram service interval?
Follow the truck’s oil-change indicator and the time, mileage, engine-hour and severe-duty limits in its exact manual. A long-distance claim on an oil bottle or filter does not replace the vehicle maintenance schedule.
Should I add a lifter treatment to stop HEMI ticking?
The covered Ram manuals strongly discourage supplemental engine-oil additives other than leak-detection dyes. They direct owners to an authorized dealer if ticking continues or the malfunction indicator light comes on. An oil shortlist cannot diagnose or repair the cause.
