Quick Answer: Is 10w30 Better Than 5w30?

Is 5w30 or 10w30 better for winter?

At operating temperatures, both oils will have the same viscosity (30) and will flow and protect identically.

If the oil will be in the engine during winter and you live in a place where it gets cold during these months, use 5w30 oil.

If it will only be in the engine during the summer, use 10w30..

Is 10w30 better for high mileage?

Both high mileage 5w30 and 10w30 engine oils have the same additives, the only difference is the viscosity at cold startups. Since both oils have the same operating temperature viscosity (30) and additives, they will perform exactly the same. However, 5w30 flows much better than 10w30 during cold starts.

What happens if you put thicker oil in your car?

Low efficiency. Using motor oil with higher viscosity (oil that is too thick) also reduces your car’s overall fuel efficiency. This is because the thicker the motor oil, the higher its resistance on vital metal components, such as pistons.

Can I mix synthetic and regular oil?

Since motor oils are generally made from the same ingredients (base oil and additives), they are typically compatible when mixed. … Keep in mind that mixing synthetic and conventional oil dilutes the beneficial effects of higher quality synthetic oil.

Is Thicker oil better for high mileage cars?

A: Yes. This is a practical method to improve oil pressure in an older, high-mileage engine. The slightly thicker oil film from the heavier base weight oil – 10W – can help protect worn engine bearings as well.

Should I use 10w30 or 5w30?

This oil is also the better of the two types for the old engines and also for those that use special fuel like biodiesel engines. With the greater sealing capability, 10W30 will be more effective at protecting the older engines than 5W30.

Should I use thicker oil in an older engine?

A: Yes. This is a practical method to improve oil pressure in an older, high-mileage engine. The slightly thicker oil film from the heavier base weight oil — 10W — can help protect worn engine bearings as well.

What happens if I put 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 it bad to mix 5w30 with 10w30?

Mixing different oils will not improve the performance or efficiency of the engine in any way. The additives in synthetic oil may have limited or no effect at all when mixed with a regular engine oil. … 5w30 and 10w30 are both 30 weight oils and the exact same thickness in your engine when it is at operating temperature.

Can you switch from 5w30 to 10w30?

Originally Answered: When should I switch from 5W30 to 10W30? You don’t really need to change to the 10W30. The 5W and 10W are the numbers that tell you the low temperature behavior of the oil and the second number tells you the high temperature behavior. The oils only differ in cold weather viscosity.

Will it hurt to put 10w30 in a 5w20 engine?

Modern cars are designed to use lower viscosity oil ranges, so they can properly lubricate ( see attachment) Going from 5w-20 to 10w-30 should cause no harm for one oil change. But if you engine as designed for 5W-20, give it 5W-20.

Which oil is best for high mileage engines?

Valvoline High Mileage with MaxLife Technology. … Castrol Edge High Mileage. … Mobil 1 High Mileage. … AmazonBasics High Mileage Motor Oil. … Pennzoil High Mileage Motor Oil. … Lucas Oil High Mileage Oil Stabilizer. … Royal Purple HMX High Mileage Synthetic Motor Oil.

Is it OK to mix different brands of oil?

Yes, you can safely mix one brand of oil (e.g. Mobil 1) with a different brand (e.g. AMSOIL) or conventional oil with synthetic oil (in fact, that’s what a synthetic blend is). Most synthetics today are fully compatible with conventional oils and can safely be mixed.

What is the best oil additive for high mileage engines?

Best Oil Additives for Older EnginesMarvel MM13R Mystery Oil. You will be surprised to find out that Marvel MM13R Mystery Oil was used in WWII on airplanes and battleships. … Lucas LUC10130. … Slick 50 750002. … Rislone Engine Treatment. … Liqui Moly (20002) Cera Tec Friction Modifier. … Sea Foam SF-16 Motor Treatment.

Is 5w30 good for high mileage?

For example, a high mileage engine oil rated at 5W30 will flow better and has a superior viscosity at low temperatures when compared to an engine oil with a rating of 10W40. If you live in a cold environment, it is always best to go with a high mileage oil that has a lower SAE rating like 5W30.