Why Oil Viscosity Matters: 0W-20, 5W-20, and 5W-30 Explained
Looking for the best auto repair shop in St. Louis? Sant Automotive helps drivers in Webster Groves, Affton, Crestwood, and South St. Louis County protect their engines with the right oil and the right maintenance schedule.
One of the biggest changes in modern vehicle maintenance has been the type of engine oil manufacturers recommend.
Years ago, heavier oils like 10W-40 were common. Later, 10W-30 and 5W-30 became popular. Today, many vehicles require lighter oils such as 5W-20 or even 0W-20.
Why Do Newer Vehicles Use Lighter Oil?
Modern engines are built with tighter tolerances and greater precision than older engines.
That means manufacturers often recommend lighter oils because they help with:
- Faster lubrication at startup
- Reduced internal friction
- Improved fuel efficiency
- Better flow through tight engine passages
In other words, if the engineers who designed the engine specified a certain oil, it is usually best to follow that recommendation.
What Happens If the Wrong Oil Is Used?
Using the wrong viscosity can lead to:
- Poor lubrication during startup
- Reduced fuel economy
- Increased engine wear
- Improper oil flow in critical engine areas
That is why oil type matters just as much as oil change interval.
Why Sant Automotive Recommends 5,000-Mile Oil Changes
At Sant Automotive, we recommend 5,000-mile oil change intervals for most vehicles.
That recommendation is based in part on the oil consumption issues many modern vehicles are experiencing.
The goal is simple:
Protect the engine, maintain proper oil level, and help prevent expensive repairs.
We Use Mobil Super™ Synthetic Oil
Sant Automotive features Mobil Super™ Synthetic motor oil for oil change service.
This helps provide:
- Strong wear protection
- Improved resistance to heat and breakdown
- Reliable performance in real-world driving conditions
Combined with a 5,000-mile service interval, it is a smart way to protect your engine over the long term.
Oil Changes Are About More Than Oil
A good oil change visit is also a chance to monitor your vehicle’s overall condition.
Routine service can help catch:
- Leaks
- Fluid issues
- Brake wear
- Tire problems
For more on staying ahead of maintenance, see our guide on how much a car check up costs in St. Louis.
Schedule an Oil Change in St. Louis
If you are not sure what oil your vehicle needs, or if you are due for service, Sant Automotive is ready to help.
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Sant Automotive • 8720 Watson Rd, St. Louis, MO 63119 • (314) 849-2900
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Sant Automotive has been recognized as one of the best auto repair shops in St. Louis, earning the ASE Blue Seal of Excellence in 2002 and being named a CarFax Top Shop for two consecutive years.
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