All 5W-30 grades are not the same. 5W-30 relates to the viscosity only, and not the manufactures spec it is manufactured to, which may require a different additive package. Our company has three different oils for different applications and they are all 5W30. Some are suitable for a CRDI (common rail) engine some aren't. As long as the Brand A and Brand B are the correct spec for your particular application then you should be OK. Even if not, it won't destroy you engine immediately. I wouldn't like to run a CRDI engine on oil not designed for CRDI engines for example.
twincam1,
Jan 19, 9:52pm
Don't mix mineral with synthetic.
kazbanz,
Jan 20, 6:35am
Short term not a darn thing.LONG term it will depend on if brand A is for a specific application and has additives specific to that application.
motorboy2011,
Jan 20, 8:55am
Any oil, even of different kinds and grades is better than none.
richardmayes,
Jan 20, 10:23am
Unless the car is a VW.
Some models require 'special' oil and other models use normal oil [same as the peasants have in their cars.] Either way, the car will blow up if you get it wrong.
You need to understand that this is a sign of how good they are.
jason_247,
Jan 20, 6:37pm
out dated opinion. Modern synthetic mix with minerals without issue
twincam1,
Jan 20, 9:40pm
If you want to stuff your engine, go for it. From Penrite. Mineral, Semi Synthetic and Synthetic oils can be mixed together, although this is not recommended.
During the blending process, various and different additive packs are added to base oil to achieve various oil specifications for different intended applications. (eg Petrol or Diesel type oil). Therefore, a combination of different oils will almost certainly have been created to cover different applications and may not always be compatible with one another. Mixing different types and viscosities of oils changes the original chemistry balance of the oil and may result in an unsuitable product for certain types of applications. So although the base oils will mix quite readily, the additive packs used in them are designed for particular applications and a combination of these is an unknown concoction in terms of performance and compatibility.
In certain circumstances, putting the wrong oil into an engine can cause extensive damage to the engine or components associated with it. It is always best to use the same type, viscosity and manufacturer specification when topping up your engine oil.
gpg58,
Jul 31, 5:18am
If your vehicle is late model with a dpf (diesel particulate filter), using the wrongly rated diesel oil could be very expensive long term. For my truck the factory oil is good for 20,000 km but if any other brand you will not get warranty back up if you go over 10,000. I see Mercedes now service @ 40,000 km or 2 years on some models.
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