Neutral · manual-first · no brand bias
Understand the right engine oil for your car.
We translate your owner's manual and OEM specifications into plain English: what the viscosity numbers mean, how grades compare, and what is safe for your car, climate, and driving. Specifications first, products second.
From the owner's manual
Use SAE 0W-20 engine oil meeting dexos1 Gen3. Capacity 4.4 L.
- Viscosity grade
- 0W-20 cold-start flow · operating-temperature protection
- Specification
- dexos1 Gen3 the approval your engine requires
- Capacity
- 4.4 L oil needed for one change
- Owner's manual first
- The exact vehicle manual is the final authority.
- Grade and specification
- Both requirements are checked separately.
- Sources and corrections
- Primary evidence, checked dates, and a public correction path.
Two fields to match
Viscosity and specification are different requirements
Every oil recommendation contains two separate requirements. Match both. The viscosity grade alone is only half the answer.
Viscosity (the grade)
0W-20
Oil thickness at cold start and at operating temperature.
Specification (the standard)
dexos1 Gen3
The required oil performance standard. Match it in addition to the viscosity grade.
What's inside
What the site can actually check
Choose a section
Start here
Choose the section that matches your question, from basic definitions to side-by-side comparisons.
- Learn What viscosity is, in plain language.
- Viscosity What 5W-30, 0W-20, 10W-40 and the rest mean.
- Compare Neutral side-by-side comparisons — no brand bias.
- Can I use… Substitution answers with a clear risk label.
- Standards API, ILSAC, ACEA, dexos and OEM approvals.
- Guides Intervals, climate, high-mileage, turbo and more.
Straight answers
Popular questions
Common substitution and comparison questions, answered with the owner's manual as the primary authority.
- 5W-30 instead of 0W-20? Generally you should not substitute 5W-30 for 0W-20 unless your owner's manual lists 5W-30 as an acceptable alternate. Engines that specify 0W-20 are designed for the thinner oil, so the thicker grade can reduce fuel economy, hurt cold-start flow, and may affect your warranty.
- Is thicker oil better? Is thicker engine oil better for your car? The short answer is no — the right oil is the grade your manual specifies, not the thickest one.
- What happens if you use the wrong oil? What happens if you use the wrong motor oil? It depends — the wrong viscosity and the wrong specification carry different, often manageable, risks.
- 0W-20 vs 5W-30 Different cold flow and different hot thickness — follow the grade your manual specifies, not the heavier one.
- 5W-30 vs 5W-20 Same SAE winter category, different hot categories. Follow the exact grade your manual specifies.
- What is oil viscosity? What motor-oil viscosity means, how kinematic and dynamic viscosity differ, why temperature matters, and how an SAE grade relates to measurements.
Why you can trust this
Independent, sourced, and kept current
We do not sell products. You can inspect our method and sources.
- Owner's manual first The exact vehicle manual is the final authority.
- Sources and corrections Primary evidence, checked dates, and a public correction path.
- No brand bias No paid placements or product-first answers. Recommendations start with specifications, not products.
- Kept current Pages show update dates, and readers can report errors for correction.
Ready to check?
Still not sure what your engine needs?
Compare the manual requirements with the bottle label, or start with your vehicle and then confirm everything in the manual.