How much oil for my stang?

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Now im pissed. My garage is too slippery to get the car onto ramps. The wheels just keeps spinning. So now I gotta take it to Valvoline and have them do it. Im way over due so I have no choice.

I wonder if I take my oil to them if they will do it or not?
 
Do not mix synthetic with conventional oil!

Mine takes 6 quarts straight up after the oil change and filter change. Try 5 and then read your dip stick... Add if you need to and then you'll know.

You can mix conventional and synthetic, wont hurt nuthin.
I would use the same brand although. I have called the tech lines at
Mobil one, Valvaline and Castrol about that very issue. You can mix
different weights as well.
 
From Mobil 1:

In general, oils should be compatible with each other. It is not likely that you would form gel by mixing the two oils. However, we would not recommend mixing oils as a general practice because oils are complex mixtures of additives and base oils that can be destabilized. Lastly, why reduce the outstanding performance of Mobil 1 by adding “regular oil”. Is it economics? You would be better to run all Mobil 1 and run it longer than mixing it with “regular oil”.