Quaker State is built for the everyday driver. The product line is designed around the demands of standard passenger vehicles: sustained highway miles, repetitive stop-and-go commuting, and the gradual wear that comes with both. If you drive a daily driver and want reliable protection without overcomplicating your oil choice, this is a line worth knowing. Formulations like All Mileage and High Mileage are aimed specifically at older engines. These address the two most common problems in high-mileage motors: oil consumption and leaks caused by worn or shrunken seals.
Popular Quaker State Motor Oils
Quaker State HD SAE 30 Motor Oil
Quaker State Motor Oil, HD 30
Quaker State HD SAE 30 Motor Oil is conventional SAE 30 oil for any vehicle that calls for that viscosity grade. Quick Specs:
- API Service Category: SN (and all previous categories)
- Kinematic Viscosity @40°C: 95.0 cSt
- Kinematic Viscosity @100°C: 11.6 cSt
- Viscosity Index: 111
- Flash Point: 232°C
- Pour Point: -30°C
- Density: 873 kg/m³
SAE 30 is a single-grade oil, which means it doesn’t use viscosity modifiers to perform across a wide temperature range the way a multi-grade like 5W-30 does. What you get instead is a stable, predictable viscosity profile. The viscosity index of 111 confirms the oil resists thinning under heat reasonably well for a conventional single-grade. This is a straightforward choice for older engines, small equipment, or any application where the manufacturer specifically calls out SAE 30.
- Passenger vehicles specifying SAE 30
- Small engines and older motors
- All driving conditions where SAE 30 is required
Quaker State All Mileage SAE 10W-40 Motor Oil
Quaker State Motor Oil, 10W-40
Quaker State All Mileage SAE 10W-40 is a conventional multi-grade oil for any vehicle specifying 10W-40, with seal conditioners built in to address leaks and oil consumption in older engines. Quick Specs:
- API Service Category: SP (and all previous categories)
- Kinematic Viscosity @40°C: 108.0 cSt
- Kinematic Viscosity @100°C: 15.7 cSt
- Viscosity Index: 154
- CCS Viscosity @-25°C: 6,210 cP
- MRV Viscosity @-30°C: 31,000 cP
- Flash Point: 200°C
- Pour Point: -33°C
- Density: 869 kg/m³
The viscosity index of 154 is notably higher than a basic conventional oil, meaning it holds its viscosity better as temperatures rise. The seal conditioning additives are the practical differentiator here. Quaker State All Mileage SAE 10W-40 is a practical choice for higher-mileage vehicles where the owner wants to extend engine life without moving up in price to a synthetic blend or full synthetic.
Quaker State Higher Mileage with Slick 50 10W-30 Motor Oil
Quaker State Higher Mileage Engine with Slick 50 10W30
Quaker State Higher Mileage with Slick 50 10W-30 is a conventional motor oil aimed at high-mileage engines. It bundles Slick 50, a friction-reducing additive compound, directly into the formulation. Quick Specs:
- SAE Viscosity: 10W-30
- Type: Conventional
- API Service Category: Not confirmed in available data
- Full kinematic viscosity, flash point, and pour point pending official TDS
The Slick 50 additive is the differentiator here. The claimed mechanism is reduced metal-to-metal contact on high-wear surfaces, which the product markets as delivering three times less cam wear than industry standard requirements. User feedback is mixed. Owners running this in naturally aspirated engines between 97,000 and 202,000 miles have reported consistent performance and no sludge issues. Some noted cooler engine temperatures and steady fuel mileage over extended use. That said, a portion of long-term users have raised concerns worth noting. Some reported sludge buildup in valve covers and cylinder heads after extended use. Others found the oil degraded faster than expected in forced induction applications, with noticeable loss of lubricity in under 2,000 miles. A few reviewers also flagged visual cleanliness as an issue, with oil darkening quickly relative to competing products. If you’re running a turbocharged engine, this is a consideration worth taking seriously before committing to this formulation.
Quaker State Advanced Durability SAE 5W-20 Motor Oil
Quaker State Advanced Durability 5W-20
Quaker State Advanced Durability SAE 5W-20 is a conventional motor oil for any vehicle specifying 5W-20, with added Low-Speed Pre-Ignition (LSPI) protection making it one of the few conventional options suitable for modern turbocharged direct injection engines. Quick Specs:
- API Service Category: SN PLUS, SN, and all previous categories
- ILSAC: GF-5
- Kinematic Viscosity @40°C: 49.8 cSt
- Kinematic Viscosity @100°C: 8.55 cSt
- Viscosity Index: 149
- Dynamic Viscosity @-30°C: 5,000 cP
- MRV @-35°C: 15,100 cP
- Flash Point: 233°C (D92) / 209°C (D93)
- Pour Point: -48°C
- Density @15°C: 855.1 kg/m³
LSPI is the practical differentiator here. It’s a known failure mode in turbocharged gasoline direct injection (TGDI) engines where uncontrolled combustion events cause sudden, severe damage. API SN PLUS certification means this oil has been tested specifically against that risk The pour point of -48°C also stands out. For a conventional 5W-20, that’s a strong cold-weather figure, meaning reliable flow at startup even in cold climates. Compatibilities:
- Ford WSS-M2C930-A / M2C945-A
- GM 6094M
Quaker State All Mileage SAE 10W-30 Motor Oil
Quaker State Full Synthetic 10W-30
Quaker State All Mileage SAE 10W-30 is a conventional motor oil covering both new and high-mileage engines under a single formulation, for any vehicle specifying 10W-30. Quick Specs:
- API Service Category: SP-Resource Conserving and all previous categories
- ILSAC: GF-6A and all previous standards
- Kinematic Viscosity @40°C: 72.38 cSt
- Kinematic Viscosity @100°C: 10.75 cSt
- Viscosity Index: 137
- Dynamic Viscosity @-25°C: 6,510 cP
- MRV @-30°C: 18,200 cP
- Flash Point: 237°C (D92) / 209°C (D93)
- Pour Point: -48°C
- Density @15°C: 868.5 kg/m³
Compared to the 10W-40 variant, the 10W-30 carries newer certifications: API SP-Resource Conserving and ILSAC GF-6A. It also adds Chrysler MS 6395 approval. The viscosity index is slightly lower at 137 versus 154, which is expected given the narrower viscosity range. The pour point of -48°C is identical to the Advanced Durability 5W-20, which is strong for a conventional 10W-30.
Popularity and Associated Vehicles
Quaker State has been in the motor oil market for over 80 years and is frequently cited as the second-largest motor oil brand in the United States, behind only Pennzoil, which is its sister brand under Shell. The brand has a few notable associations worth knowing:
- Hyundai has a long-standing relationship with Quaker State. The brand supplies the initial fill oil for Hyundai vehicles as they leave the factory, and Hyundai engine bays often carry stickers recommending it for service intervals.
- Franklin Automotive Company is where the brand built its early reputation. In 1914, Quaker State became the exclusive lubricant for Franklin cars, which had lubrication requirements that most oils of the era couldn’t meet.
- NASCAR has been part of Quaker State’s profile for years. The brand has sponsored Hendrick Motorsports and drivers including Jeff Gordon, Jimmie Johnson, and Dale Earnhardt Jr. It currently sponsors the Quaker State 400 in the NASCAR Cup Series.
Quaker State Company Background
Quaker State traces its roots to Oil City, Pennsylvania, following the discovery of oil in the region in 1859. The name comes directly from Pennsylvania’s nickname, “The Quaker State.” A few key milestones:
- 1912: T.G. Phinny of the Phinny Brothers Oil Company coined the Quaker State name to differentiate his products in a crowded market.
- 1924: Eastern Refining Company acquired the name and rebranded itself as the Quaker State Oil Refining Company.
- 1931: Nineteen regional oil companies merged on July 1st to form the Quaker State Corporation, consolidating operations into a national company.
- 1998: Quaker State merged with Pennzoil to form the Pennzoil-Quaker State Company.
- 2002: Shell Oil Company acquired the combined entity for approximately $1.8 billion. The brand is currently owned by Shell USA and headquartered in Houston, Texas.
Independent Testing of Quaker State Engine Oils
Quaker State has been put through independent laboratory testing, expert analysis, and long-term consumer use. Here’s what we’ve gathered:
Laboratory Testing
The Petroleum Quality Institute of America (PQIA) tested Quaker State Defy High Mileage Synthetic Blend 5W-30 in 2019. Their results confirmed the oil met SAE J300 viscosity specifications and matched its listed API Service Categories. The report included specific measurements for phosphorus and zinc levels (the primary anti-wear additives) and detergent concentration.
Blackstone Laboratories, which conducts routine used oil analysis for consumers, has noted they generally see little meaningful difference in engine wear between major oil brands. In a 2013 fuel economy comparison, they tested Quaker State Advanced Durability 5W-20 against Royal Purple synthetic. Quaker State returned 28.08 MPG versus Royal Purple’s 27.95 MPG in that specific test.
The margin is narrow, but it held up under controlled conditions. Quaker State has also commissioned ASTM Sequence IVA wear tests through Test Engineering Inc., a third-party R&D organization, to benchmark their full synthetic against competing products.
Expert Analysis
Certified Lubrication Specialist Lake Speed Jr. used Fourier-transform infrared spectroscopy (FTIR) to analyze the base oil chemistry of Quaker State Full Synthetic. His findings confirmed it uses Group III base oil. This distinguishes it from sister brand Pennzoil, which uses Gas-to-Liquid (GTL) technology. Both are classified as synthetic, but the refining process is different. Neither is necessarily superior, but it’s useful to know if base oil chemistry matters to your application. Consumer Reports has historically included motor oils in its large-scale testing, including a study using New York City taxi fleets to evaluate brand performance under severe stop-and-go conditions.
Community Data
On the Bob Is The Oil Guy (BITOG) forums, users regularly post Virgin Oil Analysis (VOA) reports on Quaker State products. These are independent spectroscopic breakdowns of fresh, unused oil that show exactly what’s in the additive package before it ever enters an engine. It’s a useful reference if you want to verify label claims before committing to a product. Consumer review data is more anecdotal but consistent.
On RateItAll, Quaker State holds an 84% approval rating across 43 reviews, with recurring mentions of long-term reliability and value. One user reported their engine crossed 433,000 miles on Quaker State exclusively. That’s a single data point, not a controlled study, but it’s the kind of real-world outcome that shows up repeatedly in long-term owner communities.
Closing Notes
Quaker State sits in a practical middle ground: independently verified performance at a price that doesn’t demand a premium. PQIA testing confirms its fluids meet labeled specifications, and certifications like API SP-RC, ILSAC GF-6A, and GM Dexos1 Gen3 cover the demands of modern turbocharged engines. The 10-year/300,000-mile limited lubrication warranty backs that up for owners who plan to keep their vehicles long-term. For budget-conscious buyers, the value case is straightforward. Blackstone Laboratories found little meaningful difference in engine wear between Quaker State and its premium sibling Pennzoil. On the practical side, the product line scales from 1-quart top-off bottles for DIY owners to 250-gallon totes for commercial quick-lube operations, making it a workable option regardless of how you maintain your fleet. ) Quaker State motor oils meet API SP-RC and ILSAC GF-6A standards. See full specs, independent test results, and product comparisons.
