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Yes you can. I spoke to Castrol customer service on 16 Feb 12 and asked if I could mix a left over 1 gallon bottle of the older Syntec with the newer Edge formula I just purchased. I was told as long as they are the same viscosity, they can be mixed.

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Can you mix castrol syntec with castrol edge?

This is from Castrols customer service after I emailed them this same question... Our previous Castrol SYNTEC product has been improved, renamed and repackaged as Castrol EDGE with Syntec Power Technology (SPT) however it remains in a black bottle and is fully compatible for use with the previous Castrol SYNTEC product so as always, you can use the same SAE grade of either product together for 'topping off' purposes without fear. The new Castrol EDGE with SPT is not only as good as the previous Castrol SYNTEC product that you were using but better!


Can you mix different weight motor oils like castrol 10w30 with castrol 20w50?

why would you want to? Yes you could, the viscosity will average out .


What happen if you add two different kinds of oil to a motor?

Nothing if they were approved oils. You can mix 10w30 with 5w20 etc. Not a good idea but you can do it. You can mix brands with no problem.


Can you mix 10w30 oil with 10w40 in a 1991 Chrysler LeBaron?

Yes, as long as the ambient temperature is above fifty degrees.


Should you Mix 5-30 10-30 syntec oil?

I think you can mix them without doing any damage to the engine. I think you can even add a quart of synthetic oil to regular oil if your engine is low on oil. Generally you would want the 5-30 in an area where it is colder.


The razor's edge?

They are a mix of Amstaff,staffie and American pit.


What is edge finishing move?

Edge's Finishing move is called Edgecation. It is a mix between a facing bulldog and a ddt. Hope this helps!


What is edge finishing?

Edge's Finishing move is called Edgecation. It is a mix between a facing bulldog and a ddt. Hope this helps!


What breeds make a razor edge?

Razor edge started with game pitbull bloodlines. Noone knows the mix added to create them but the breeder himself.


What if you mix oils 10w-30 motor oil with 5w-30 oil on accident?

No worries. If 10w30 was suited for your current climate then your new mixture will do just fine. If you needed to use 5w30 because the temps are still below zero in your area, then you may want to change to entirely 5w30. I remember hearing about people with LS1's in their Camaros mixing 4 qts of Mobil 1 10w30 and 2 qts of 15w50 in order to achieve a mix that was similar to a 10w40.


Can you mix 5w30 oil with 10w30 oil?

You should never MIX different weights of oil. The above answer is correct, but if you find yourself in one of those unavoidable situations where you have no choice, go ahead and mix whatever you have to. It's better for the crankcase to be full than to have exactly the right oil in it. If it really grabs at your conscience, change the oil and filter as soon as you can.


What brand or type of motor oil is best for a Dodge Ram with a 318 c.i. V8 engine?

Any name brand 10w30 would be fine. Don't mix synthetic and non-synthetic oils.