[GWN7]

I wouldn't have paid the bill. I would have told the salesman that life is hard, it's even harder when you are stupid and lie to people to make a sale.

I would have told the service and sales managers that you didn't pull the first service free deal out of your a$$ and you expect them to make good on it.

Now that you have paid for the service and have figured out that they did it wrong I would contact Suzuki. Explain what has transpired. Tell them the dealer admitted to using Valvoline oil and you want to know if your warrantee is now void? I would bet you get your service redone for free and get the money you paid to the dealer for them to do the work done wrong back.