It is always advisable to not mix motor oilbrands, however, different viscosity grades of the samebrand motor oil are compatible. Be aware that mixingviscosity grades will turn out a product that isdifferent in viscosity than either what wasoriginally in the engine or what was added.".
Herein, is it OK to mix different weights of motor oil?
Mixing different oils will not improve theperformance or efficiency of the engine in any way. Theadditives in synthetic oil may have limited or no effect atall when mixed with a regular engine oil. You can use1 litre of 5W30 mixed with 5W40 and it will not cause anysort of ill effects to the engine.
Similarly, can you mix 5w30 with 10w30? If your car contains a typical multi-grade oil, such as5W-30 or 10W-30, you can use most anymulti-grade oil to "top off" your oil and bring it up to a properlevel. Mixing the viscosity of oil has no effect on theengine. 5W30 and 10W30 are very close inviscosity.
Just so, can you mix different brands of synthetic motor oil?
Yes, you can safely mix one brand ofoil (e.g. Mobil 1) with a different brand (e.g.AMSOIL) or conventional oil with synthetic oil (infact, that's what a synthetic blend is). Most syntheticstoday are fully compatible with conventional oils andcan safely be mixed.
Can you mix 0w20 and 5w30 oil?
Mixing 0w20 and 5w30 will typically giveyou a heavy 20-weight or light 30-weight. If you wantto stay in the 20w range with the M1 you could get away withmixing up to about a quart and a half of the 5w30with the 0w20.
Related Question Answers
Can I put 5w30 instead of 5w40?
If you are racking your brain to choose between5w30 and 5w40, we recommend you go with 5w30.However, if it is too expensive or not available for use,you can always go with the 5w40, which is just asgood and will not cause any damage to the engineparts.Can I use 10w 40 instead of 5w40?
10w40 is a slightly thicker (viscosity) oil than5w40, a lower viscosity oil protects better from cold, it'salso recommended for new engines with very tight tolerances, butpour it into an older engine and the piston rings willstruggle to keep it out of the combustion chamber and you'll burnoil.What happens if you use 5w 20 instead of 5w 30?
In your case, where you need 5W-20instead of the recommend 5W-30, yes it does makea difference. Engine oil is effectively a giant system of fluidbearings. This means that the surfaces within your engine don'tactually touch, there is a thin wedge of oil between them. Yourengine will wear out faster.Is it OK to mix synthetic oil with regular oil?
The simple answer: Yes. There is no danger mixingsynthetic and conventional motor oil; however,conventional oil will detract from the superior performanceof synthetic oil and reduce its benefits. So, yes, you cansafely mix synthetic and conventionaloil.What's the difference between 5w30 and 5w40 oil?
In fact, the only major difference between?5w30 and 5w40 is the viscosity in warmer temperatures.?This makes the 5w30 better suited for colder temperaturesand the 5w40 better suited for warmer ones.Can I mix 10w40 with 20w50?
Re: 20w50 and 10w40 mix The filter holds a good amount of oil, so yes, youwill be mixing two different grades of oil whichcan lead to it congealing and cacking up all your oilways.What is the difference between 5w20 and 5w30?
The key difference between 5W20 and 5W30 motoroil is that the former is thicker or less viscous. On the otherhand, 5w30 motor oil is a suitable choice for hotterclimates where thinner oils tend to break down under hightemperatures.What is the difference between 10w 30 and 10w 40?
The difference between 10W-30 and a10W-40 is the high temperature viscosity. Obviously,a 10W-40 is thicker than a 10W-30 athigh temperature. Using the correct viscosity oil eases starting,reduces friction and slows wear.Is it bad to mix motor oil brands?
Mixing Motor Oil According to Mobil Oil, it should be fine tomix oils. So, if you are low on oil, don't be afraidto add a quart or two of synthetic oil if you are usingregular oil or even regular oil if you are using asynthetic.Can I mix two different brands of engine oil?
There is no problem with mixing oils, eithermixing viscosities or brands, or synthetics withmineral. It is done all the time. 15 to 20% of the old oilstays in your engine when you do an oilchange, so change brands or viscosities, or change tosynthetic, and you are doing this.Is it OK to switch motor oil brands?
MYTH: Switching motor oil brands is harmful to myengine. No. Switching brands is not harmful to yourengine as long as you choose an oil marked with the APIdonut of the same level, e.g., API SN. You may give up enhancedperformance if you switch from synthetic or high mileage toconventional oil.Can you mix Mobil 1 with Castrol?
can i mix castrol syntec with mobil1 synthetic? No, you can't mix these two.Mixing oil brands, synthetic/non-syn,etc isn't a big deal,but both oils must be of the same viscosity. Keep doingit.Are all full synthetic oils the same?
Synthetic oil is better than conventionaloil, if you buy a good brand name, and the right grade ofoil for the application. But no, all synthetic oilsare not the same. First off, they are manufactured todifferent specifications for different applications, just likeconventional oil.Can you mix semi synthetic and fully synthetic engine oil?
As a general rule of thumb, we don't recommendmixing different oils. However nothing detrimentalwill occur if you mix synthetic oil with eithersemi-synthetic or mineral oil. If this wasyour only option, mixing oils would be better than runningout of oil and potentially causing damage to yourengine.Can you mix regular transmission fluid with synthetic fluid?
Is it OK to mix synthetic ATF with aconventional and/or synthetic blend ATF? Yes.Synthetic ATF and conventional fluids are 100 percentcompatible with each other.Can you mix Castrol Edge with magnatec?
To reap the full benefits of Castrol MAGNATEC, acomplete change of oil is recommended. So we've gotCastrol talking out of both sides of its mouth at the sametime. Mix away. The motor will still outlast the restof the vehicle.Can you mix amsoil with other oil?
AMSOIL synthetic motor oils are compatiblewith other conventional and synthetic motor oils.Mixing other oils with AMSOIL motor oils,however, will shorten the oil's life expectancy andreduce its performance benefits. AMSOIL does not supportextended drain intervals where oils have beenmixed.Will 10w 30 oil hurt a 5w30 engine?
Oh and your engine will be fine don't worry, butagain your lifters may make a loud clicking sound for about 2seconds while the thicker 10w-30 oil goes up throughthe engine during winter. As far as the Mercedes goes. Sowhile using 5w30 wouldn't hurt idk about 10w30that's a bigger jump than 1 to the next.Does 10w40 hurt 5w30 engine?
Your vehicle does not use 5W-30 oil. Therecommended oil viscosity for your vehicle, according to Kiadocumentation, is 10W-40. If you drive the vehicle inexceptionally cold weather, well below 32 degrees, you canuse 5W-30 oil but even 10W-40 is still perfectly OKto use if outdoor temperatures are below freezing. 
