Offer them anything less than 4. Otherwise don't go for it. A 98 with tempered numbers can't be sold at the price you have mentioned. If they really need to sell it, they would or they will keep it with themselves as it wouldn't be sold this easy.
And yes! If they agree at the above mentioned price, go for it but if you need to sell it in the near future, don't. You will have to struggle for at least 6 months in order to get it sold.