Which Oil Is Best For High Mileage Engines?

Is synthetic oil better for high mileage cars?

Myth: Full synthetic oil is not good for high mileage cars or older vehicles.

The myth is rooted in the idea that synthetic oil is “slipperier”—lower in viscosity, or not as compatible with seals and will therefore leak or leak more in places conventional oil might not.

Again, completely untrue..

Will thicker oil damage my engine?

Not only that, but the engine will waste energy pumping the thicker motor oil, reducing fuel economy. Since thicker oils don’t transfer heat as well as thinner oils, operating temperatures will increase, too, possibly leading to accelerated chemical break down and harmful sludge and deposits.

Will 5W30 hurt a 5W20 engine?

There is no harm in using 5W30 instead of 5W20. They are pretty close.

Will synthetic oil hurt older engines?

Using synthetic oils in older models When using the term “older” to refer to cars, it means those manufactured before 1990 or so. The risk with these models is that the seals and other components often aren’t as tight as with newer models. The synthetic oil could leak out and the vehicle could burn or lose oil.

What is the best synthetic oil for high mileage cars?

Pennzoil Platinum High Mileage Full Synthetic Motor Oil. Castrol EDGE High Mileage Full Synthetic Motor Oil. Valvoline Full Synthetic High Mileage Motor Oil. Royal Purple HMX High Mileage Synthetic Motor Oil. Shell Rotella T6 Full Synthetic Diesel Engine Oil. Mag 1 Full Synthetic Motor Oil.More items…•Nov 20, 2020

Should I use thicker oil in a high mileage 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 weight oil is best for high mileage?

#1 – Mobile 1 High Mileage Synthetic Oil.#2 – Royal Purple HMX Synthetic Oil.#3 – Mobile Super High Mileage Synthetic Oil.#4 – Castrol GTX High Mileage Synthetic Blend Oil.#5 – Pennzoil High Mileage Synthetic Blend Motor Oil.Dec 21, 2020

What oil is best for older engines?

When you’re choosing the best oil for older cars or high mileage engines, there are several criteria you can look at.Pennzoil High Mileage Conventional Motor Oil. … Castrol GTX Part-Synthetic High Mileage. … Valvoline MaxLife High Mileage Synthetic Blend. … Mobil1 High Mileage Engine Oil. … Amsoil Premium Protection Motor Oil.More items…•Nov 13, 2018

Can I mix synthetic and regular oil?

Yes. There is no danger mixing synthetic and conventional motor oil. However, conventional oil will detract from the superior performance of synthetic oil and reduce its benefits.

Is 5w30 good for high mileage?

5W-30 motor oil is the top viscosity recommendation by automakers over the past four decades for use in many vehicle types. … Furthermore, high-mileage 5W-30 motor oil is specially formulated for late model vehicles or newer vehicles with over 75,000 miles/120,000 kilometers.

Is it OK to use 0w20 instead of 5w30?

0w-20 is simply a different viscosity of oil. It won’t be an advantage to your engine if your manufacturer suggests you use 5w-30 and may indeed be a detriment to your engine. 0w-20 may be a recommended oil for certain conditions for your engine and may not be recommended for your engine.

Can I mix 5W30 with 10W30?

Yes, if topping up. If your oil must be topped up, then you are burning oil already, so the difference won’t cause more damage than is already there. 5W30 and 10W30 are essentially the same at operating temperature. It is only for cold weather starting that the performance will be different.

How many miles is Castrol GTX High Mileage good for?

15,000 milesMost synthetic oils, such as Castrol, are rated to last between 10,000 and 15,000 miles or six months.

Which oil is thicker 5w30 or 10w30?

10w30 is thicker then 5w30 because it has a higher viscosity in low temperatures. The engine oil will flow slower than 5w30 during the cold season. Thicker or higher viscosity metal oil has a better seal compared to low viscosity oil.

Is it better to use thicker oil in older engines?

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.

Is 5w20 good for high mileage?

​5w30 or 5w20 for high mileage 5w-20 or 5w-30 oil can work effectively with a high mileage car. The former is more appropriate in cold weather, while the latter is advisable during a warmer temperature. The trick for high mileage cars to use an oil that is desirable and won’t be affected by extreme temperatures.

What’s the difference between high mileage oil and synthetic?

High mileage oil is designed for vehicles with more than 75,000 miles. … As a rule of thumb, most new cars require synthetic oil. Older cars generally run well with conventional oil, unless your vehicle has more than 75,000 miles on it, in which case high-mileage oil is recommended.

What happens if I put 10w40 instead of 5w30?

If you use 10-w-40 instead of 5-w-30 specified by the manufacturer then the viscosity of 10-w-40 used by you will be higher and oil thicker than what is specified during winters. Similarly the oil viscosity will be higher and oil thicker than specified during summers.

Can I mix 5w30 with 10w40?

As posted above, mixing 5w30 with 10w40 will give you an oil that performs somewhat better in the cold than 10w40, but less good cold than 5w30, and that has a viscosity a bit higher than 5w30 but a bit lower than 10w40.

Do oil brands matter?

Generally, brand matters a lot. Amsoil, Mobil 1, and Castrol are all great. … I run Castrol in my older cars and Mobil 1 in newer cars that I care more about. Store brands like super tech are unknown to me.