For a normal car that calls for 5W-30, the four shelf brands are closer than their ads suggest. Mobil 1, Castrol Edge, Pennzoil Platinum and Valvoline Advanced all meet API SP or SQ with ILSAC GF-6A or GF-7A, three of the four list GM dexos1 Gen 3, and the 5-quart jugs run $27 to $36 at Walmart. Amsoil Signature Series costs two to three times as much per quart and makes its case on 25,000-mile drains and in-house test results, not OEM licenses.
This comparison is built from each maker's product data page, retailer listings opened in October 2026 for price, and owner reports on BITOG. Nobody here has run a lab test. Where a brand only publishes a claim, it's labeled as the brand's claim.
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The same rows for every brand
Row | Mobil 1 5W-30 | Castrol Edge 5W-30 | Pennzoil Platinum 5W-30 | Valvoline Advanced 5W-30 | Amsoil Signature Series 5W-30 |
|---|---|---|---|---|---|
API and ILSAC | API SQ, GF-7A | API SQ, GF-7 (Walmart listing) | API SQ, GF-7A (Walmart listing) | API SP, GF-6A (2022 data sheet) | Not stated on product page |
dexos1 Gen 3 | Licensed | Listed | Not listed on page opened | Licensed, license numbers printed | Not stated |
Ford specs | WSS-M2C929-A, 946-A, 946-B1, 961-A1, 971-A1 | WSS-M2C946-B1, 961-A1 | WSS-M2C961-A1, 971-A1 | WSS-M2C961-A1 | Not stated |
Chrysler specs | MS-6395, MS-13340 | MS-6395 | MS-6395 | MS-6395, MS-13340 | Not stated |
Honda HTO-06 | Yes | Listed on PSC page for older formula | Not listed | Not listed | Not stated |
Base oil claim | Synthetic, no base named | Synthetic with Fluid Titanium | Full synthetic; Pennzoil markets gas-to-liquid base | Full synthetic | 100 percent synthetic |
KV at 100°C | 10.7 cSt | Not on pages opened | Not on pages opened | 10.6 cSt, HTHS 3.2 cP | Not on page |
Pour point | -42°C | Not on pages opened | Not on pages opened | -36°C or lower | Not on page |
Claimed interval | 15,000 miles or 1 year, guaranteed | 20,000 miles or 1 year | No mileage figure on page | No mileage figure | 25,000 miles cited in LSPI test footnote, no interval printed |
Price per quart, 5-qt jug | About $7.19 (Extended Performance, $35.97 at Walmart) | $5.50 ($27.48 at Walmart, out of stock) | $7.19 ($35.97 at Walmart) | Jug price not opened; data sheet only | $17.99 per quart retail (Amsoil) |
The Mobil 1 price is for Extended Performance because that's what Walmart's Mobil page showed in 5W-30; the standard jug is usually a few dollars less. Slickdeals logged the Mobil Full Synthetic High Mileage 5-quart at $19.98 on sale at Walmart in February 2026, against a $27.88 regular price, so sale prices move the whole table.
What each brand is actually selling
Mobil 1's pitch is coverage. Its 5W-30 page lists more OEM specs than any other brand here, including Honda HTO-06 and Ford's current 971-A1, with a 15,000-mile guarantee behind it. On BITOG it's the default recommendation because every Walmart has it.
Castrol Edge sells on strength claims: three times the viscosity-breakdown resistance of the leading synthetic and ten times better high-stress performance in the Sequence IX test. Those are Castrol's own comparisons. What you can verify is the spec list, which covers dexos1 Gen 3, Ford and Chrysler, and the price, which was the lowest per quart of the five.
Pennzoil Platinum sells on cleanliness. The claim on the Walmart page is pistons cleaner than the toughest industry standard requires, based on Sequence IIIH results, with no percentage given. It carries SQ and GF-7A and both current Ford specs, but the page I opened did not list dexos1, so GM owners should check the bottle.
Valvoline Advanced is the only one of the four that publishes real numbers on a data sheet: 10.6 cSt at 100°C, viscosity index 165, HTHS 3.2 cP, Noack under 15 percent, zinc 940 ppm. The sheet is dated 2022 and still says SP and GF-6A. A 2015 BITOG thread treated Valvoline's old "40 percent more wear protection" ad as marketing, and one member noted its synthetics aren't usually pushed for long drains.
Amsoil Signature Series sells on tests it ran itself. The page claims 4 times more LSPI piston protection after 25,000 miles, 72 percent more deposit protection than Sequence IIIH requires, and zero oil screen plugging after 125,000 miles in a 2025 F-150 Raptor. The footnotes are honest that some figures come from other grades. There's no OEM license list on the page, and the quart is $17.99 retail with a $4 member discount.
Which to pick by use
Daily driver under warranty: any of the four shelf brands that prints your maker's spec on the back. Mobil 1 if the car is a Honda or Ford, because it lists the most specs. Castrol Edge if it's the cheapest jug on the shelf that day, which it often is.
High mileage: the high-mileage versions of Mobil 1 or Pennzoil Platinum, which add seal conditioners. Mobil 1 Extended Performance High Mileage was $35.97 for 5 quarts at Walmart. A BITOG owner said Valvoline MaxLife still looked thick after 5,000 miles through a hard winter, which is the point of those formulas.
Turbo direct injection: anything with the SP or SQ rating, because that's where the LSPI test lives. Pennzoil Platinum and Mobil 1 both carry SQ on the pages opened. Avoid old GF-5 stock.
Cold climate: Mobil 1's -42°C pour point is the lowest published figure here, with Valvoline at -36°C or lower. The others don't print one.
Long drain intervals: Amsoil Signature Series or Mobil 1 Extended Performance. BITOG's 2024 extended-performance thread ranked Pennzoil Ultra Platinum first, Mobil 1 EP second and Valvoline Extended Protection third on price and reputation, then noted Amsoil for anyone going past 15,000 miles. The same thread's advice was to use oil analysis before trusting any 20,000-mile claim.
Track days: none of these is a racing oil. Mobil 1 0W-40 or 5W-50, Castrol Edge 5W-50 or a Red Line or Motul product with a higher HTHS is the usual answer, and that's a different article.
What the OEM license means
A dexos1 Gen 3 license or a Ford WSS spec means the maker paid to have the oil tested against that OEM's protocol. "Meets or exceeds" with no license number means the maker says so. Valvoline prints its dexos license numbers on the sheet, Mobil says "licensed", and Castrol and Pennzoil list the spec. For a warranty claim, a licensed oil is the easier conversation.
Check your manual. The grade is on the fill cap and the spec number is in the capacities section at the back of the manual. GM manuals say dexos1, Ford manuals print a WSS number, Chrysler manuals say MS-6395.
What to do today
- Read the fill cap for the grade and the manual for the spec, then ignore any brand that doesn't print that spec on the jug.
- Compare 5-quart jug prices, not quarts. On the day I looked, Castrol Edge was $27.48 and Mobil 1 EP and Pennzoil Platinum were $35.97 at Walmart.
- Check the API donut on the back for SP or SQ. GF-5 or SN-only bottles are old stock.
- If you want to run past 10,000 miles, send a used oil sample to a lab like Blackstone before trusting a jug's mileage claim.
- Pick one brand and stay with it between changes; owners on BITOG say switching every change tells you nothing.
Sources
- Mobil: Mobil 1 5W-30 product data
- Walmart: Mobil 1 Extended Performance listings
- Walmart: Castrol Edge 5W-30 5-quart
- Petroleum Service Company: Castrol Edge 5W-30
- Walmart: Pennzoil Platinum 5W-30 5-quart
- Valvoline Advanced Full Synthetic 5W-30 product data sheet (PDF)
- Amsoil: Signature Series 5W-30
- Slickdeals: Mobil Full Synthetic High Mileage 5W-30 5-quart, $19.98
- BITOG: The Battle of the EP Oils
- BITOG: Mobil 1 vs Valvoline Synthetic
Featured image: Mobil 1 Synthetic Motor Oil by JeepersMedia, CC BY 2.0. Source
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