Oil Change in San Marcos, TX

About This Service

Our oil change service replaces degraded motor oil with premium full synthetic or synthetic blend oils and a fresh filter. Reduces engine friction, clears sludge, and stabilizes thermal breakdown — maximizing fuel economy and engine longevity. Includes fluid top-offs, air pressure check, and a basic inspection.

Motor oil breaks down over time, losing its ability to lubricate, cool, and clean internal engine components. A fresh oil and filter change removes accumulated contaminants, restores proper viscosity, and protects metal surfaces from friction-induced wear. We use premium full-synthetic and synthetic-blend oils matched to your vehicle's specifications, and every service includes a fluid top-off and a quick visual inspection of belts, hoses, and tire pressure.

• Removes sludge and combustion byproducts
• Restores proper oil viscosity and film strength
• Includes fluid top-offs and basic visual inspection
• Full-synthetic and synthetic-blend options available

At Riley Auto Care & Transmissions, we've been serving drivers in San Marcos and throughout Central Texas since 1978. Our certified technicians use the latest diagnostic equipment and quality parts to get your vehicle back on the road right the first time.

We'll give you an honest assessment and a clear written estimate before any work begins. No surprises — just straightforward service you can trust.