The difference between 10w30 and 10w40 is thethickness of the oil at operating/high temperatures, atwhich 10w40 is thicker than 10w30.

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Keeping this in consideration, is it OK to put 10w40 in a 10w30?

The only difference between 10w30 and10w40 oil is their thickness at engine operating (hot)temperatures. Using 10w40 oil in the summer will help theoil stick to internal components in high temperatures, avoiding thewear and tear from metal-to-metal contact between movingparts.

Beside above, what is 10w 30 oil recommended for? 5w30 is a great multigrade oil for use in lowstarting temperatures as well as high summer temperatures. It isalso more fuel efficient since it creates less drag on the bearingsand moving engine parts. 10w30 is thicker and may providebetter sealing capability for older engines.

Also know, can I use 10w 40 in my car?

The recommended oil viscosity for yourvehicle, according to Kia documentation, is10W-40. If you drive the vehicle inexceptionally cold weather, well below 32 degrees, you canuse 5W-30 oil but even 10W-40 is still perfectlyOK to use if outdoor temperatures are belowfreezing.

When should I use 10w40 oil?

When to Use 10w30 vs 10w40 Using 10w30 oil in cold weather will help reduceexcessive oil temperatures and drag as the engine warms up.Using 10w40 oil in the summer will help the oil stickto internal components in high temperatures, avoiding the wear andtear from metal-to-metal contact between movingparts.

Related Question Answers

What oil is thicker 5w30 or 10w40?

The 'w' means winter, implying the viscosity at whichthe oil will flow when the car is starting or at lowtemperatures. The 5w30 oil will flow better at lowtemperatures than the 10w40 oil. At high temperatures, the5w30 oil is thinner than that of 10w40 since 30 islower than 40.

What does the W stand for in oil?

The "w" in motor oil stands for winter.The first number in the oil classification refers to a coldweather viscosity. The lower this number is, the less viscous youroil will be at low temperatures. For example, a 5W- motoroil will flow better at lower temperatures than a 15W- motoroil.

Can I use 10w30 oil in my lawn mower?

Yes! We have modified our engine oilrecommendations to state that you may now use a synthetic5W30 (100074WEB) or 10W30 oil in all temperature ranges.Keep in mind that the use of synthetic oil does notprevent you from performing your regularly scheduled lawnmower maintenance (i.e. check oil, change oil,etc.).

How often should you change your oil?

Most cars can go at least 5,000 miles before an oilchange. “Change your car's engine oil everythree months, or 3,000 miles.” At one time, that was standardauto advice.

What is high mileage oil?

This can result in lower oil consumption. Manyhigh mileage motor oils include detergents and claimthey are are designed to remove sludge from engines. Most highmileage oils are formulated to benefit vehicles with 75,000miles or more.

What is SAE grade?

The Society of Automotive Engineers (SAE) hasestablished a numerical code system for grading motor oilsaccording to their viscosity characteristics. The originalviscosity grades were all mono-grades, e.g. a typicalengine oil was a SAE 30. The document SAE J300defines the viscometrics related to thesegrades.

Is Thicker oil better for older engines?

A: Yes. This is a practical method to improve oilpressure in an older, high-mileage engine. The slightlythicker oil film from the heavier base weightoil — 10W — can help protect worn enginebearings as well.

What happens if you use the wrong oil?

The brand of motor oil matters little, but itsviscosity grade (10W-30, for example) is important. Use onlywhat the owner's manual specifies. Using the wrong oil canlead to reduced lubrication and shorter engine life. If themanual says to use synthetic oil, do so.

What is the best oil for older engines?

In most temperate climates, a 10W oil willsuffice, but the best motor oil for high mileageengines in cold weather will start with 5W or even0W.

What happens if you put thicker oil in your car?

Not only that, but the engine will waste energypumping the thicker motor oil, reducing fuel economy.Since thicker oils don't transfer heat as well as thinneroils, operating temperatures will increase, too, possiblyleading to accelerated chemical break down and harmful sludge anddeposits.

Which is thicker 10/40 or 20 50 oil?

The smaller number, (the 20 part of 20w-50) describeshow the oil behaves at 40 deg C and a 20w at 40 deg C isabout 10 times thicker than your engine wants. A 10w-40 isbetter at around 6 times thicker and a 0w-40 is much betterat about 4 times thicker.

Can I use 10w 40 instead of 5w30?

10W30 means the oil will be a little thicker atthe same lower temperatures, and will then protect theengine the same as 5W30 at higher (operating warm)temperatures. 'W' means, useful for winter usage. So, youcan see, my car also recommends 5W30.