Can you use 10w30 instead of 5w30?

Most oils will mix perfectly, provided they have a similar synthetic. Therefore, there is no problem in mixing 10w30 and 5w30 since one will be topping up. Mixing the viscosity of oils will not have any effect on the engine. 5w30 and 10w30 engine oils have close viscosity, and thus there is no harm in mixing them.

Is Castrol oil good for high mileage?

Castrol® GTX® High Mileage motor oil is the leading consumer high miles brand. You won’t need to worry about using a high mileage oil or synthetic because this is both. When you want to extend the life of your high mileage engine and emission system, there is no better choice than Castrol GTX High Mileage Motor Oil.

Is Castrol a good brand of oil?

Our top pick: Castrol EDGE 5W-40 Advanced Full Synthetic Motor Oil because it’s highly recommended for BMW, Mercedes Benz, and Porche.

Is it worth using high mileage oil?

Who needs high mileage oil? Cars with more than 75,000 on their odometer can usually benefit from high mileage oil. Older vehicles with fewer miles can benefit too, as engine seals can erode over time regardless of mileage. Degraded seals mean leaking oil, and leaking oil means your engine isn’t working at its best.

Is high milage oil worth the extra cost?

If an engine isn’t burning or leaking oil, or if it uses, say, less than a quart over 6,000 miles or so, switching to high-mileage oil may not be worth the extra cost for you. It’s really a judgment call if you should pay more for high-performance oil when your vehicle has 100,000 miles on it but is using little or no motor oil.

What is the best high mileage synthetic oil?

Castrol GTX is the best high mileage motor oil, according to, garnering a five out of five-point review. Conditioner additives increase the longevity of engine seals, reduce leaks and prevent sludge deposits. BestCovery also recommends Mobil 1 , Pennzoil , Amsoil Extended Life Synthetic and Valvoline MaxLife high mileage oil.

Is Castrol oil synthetic?

Castrol EDGE BIO-SYNTHETIC is Eco-Engineered to combine Fluid TITANIUM Technology with the natural lubricating properties of plants. Made with 25% plant based oil, Castrol EDGE BIO-SYNTHETIC is both Titanium strong and renewable.

Who makes oil for AutoZone?

AutoZone’s house brand of motor oil is supplied by the Dunn, North Carolina-based Warren Oil Company. Warren Oil took over AutoZone’s previous supplier, Coastal Unilube, in 2004.