Yes, you can mix 10W-40 oil with 5W-30 oil, but there are some important considerations to keep in mind:
- Brand Compatibility: Mixing oils from different brands may not be ideal. Each brand uses different additives, and if you mix multigrade oils of different brands, the additives and viscosity index improvers (VIIs) may not be compatible. This could potentially lower the performance of your engine.
- Engine Type: Consider the type of engine you have. Some engines are more sensitive to oil viscosity variations. Always refer to the manufacturer’s recommendations for the specific oil type and viscosity suitable for your engine.
- Weather Conditions: The choice between 5W-30 and 10W-40 depends on the weather. Both oils are multigrade, meaning they change viscosity based on temperature. 5W-30 acts as 5W in winter and SAE 30 in summer, while 10W-40 acts as 10W in winter and SAE 40 in summer.
- Emergency Measure: Mixing these oils should be treated as an emergency measure only. When you blend 5W-30 and 10W-40, the resulting oil will have characteristics somewhere between the two original oils.
Remember to consult your vehicle’s manual or a professional mechanic for specific guidance based on your engine and driving conditions. It’s essential to maintain the right oil specifications for optimal engine performance and longevity.
