Engine Oil vs. Gear Oil: Can You Use Engine Oil as Gear Oil?
Engine oil and gear oil are not interchangeable. Using engine oil in your gearbox can lead to severe damage due to their fundamental differences in formulation and…
Leaks, burning oil, dirty filters, warning signs and how to stay ahead of them.
Open the guide → 02🛢️Synthetic vs conventional, high-mileage, and which grade your car calls for.
Open the guide → 03🔧Step-by-step, intervals, tools, and how much oil your engine needs.
Open the guide → 04🏷️What an oil change costs, where it is cheapest, and quart-vs-jug math.
Open the guide →The grade chart
Most "what oil?" questions are really grade questions. Here is what the common ones are built for.
Newer engines, cold climates. Thinnest flow for fast starts and fuel economy.
The all-rounder. The most common spec in North America.
Performance & diesel. Holds thicker when hot — turbos and towing.
Older or high-mileage. Extra hot-viscosity cushion for worn engines.
Our standard
Oil advice is worthless if it ignores your engine's spec. Everything here anchors to what the manufacturer actually calls for.
Grades and approvals trace to owner's-manual requirements and standards like API and ILSAC.
The 3,000-mile rule and "thicker is better" get called out where they show up, with the reasoning.
If a guide and your manual disagree, the manual wins — and we say so. Read the editorial policy.
Straight talk on engine oil — grades, brands, and what your car actually needs.
Motor Oil Zone is a participant in affiliate advertising programs operated by Amazon and eBay. We may earn a commission on qualifying purchases made through links marked as sponsored, at no additional cost to you. This does not influence our recommendations. As an Amazon Associate we earn from qualifying purchases. Affiliate Disclosure
Engine oil and gear oil are not interchangeable. Using engine oil in your gearbox can lead to severe damage due to their fundamental differences in formulation and…
The old 3,000-mile oil change rule is often outdated. Discover the five critical factors that determine your actual oil change interval and save money without…
Curious about the origin of your Wix filters? This guide reveals where Wix filters are manufactured and what it signifies for your vehicle's ongoing performance and…
A conventional oil change involves replacing your vehicle's old engine oil and oil filter with fresh, conventional motor oil.
For most vehicles using full synthetic oil, you can typically go between 7,500 and 10,000 miles, or about every 6 to 12 months, before needing an oil change.
Mixing engine oil from different brands is generally not recommended due to potential compatibility issues that can harm your engine.
Locating the correct oil filter part number for your Lexus RX350 is crucial for optimal engine health and performance.
Synthetic 5W30 motor oil offers superior protection and performance, keeping your engine running smoothly for years.
Is Pennzoil full synthetic oil truly a good choice for your vehicle? This guide breaks down what makes it stand out, covering its benefits, how it compares to…
Upgrading your Chevy 350 with the right oil filter adapter is key to enhancing oil flow and simplifying maintenance.
Choosing the right lubricant for your air compressor is vital for its longevity and performance.
Understanding the typical duration of a Jiffy Lube oil change is key to planning your day. Most visits conclude swiftly, often under 30 minutes, allowing you to get…