i am trying to buy a car with my bitcoin without convert my bitcoin to Fiat if its possible suggest me any idea.
it is very possible for you to buy it,
but so far i can not see an officiall statement for any car company accepted bitcoin as their alternative payment,
you only can buy it from other people hand (From reseller or Second hand[Pre-Owned]).
Go this link to this link :
https://duosear.ch/f54e564cfa3f0fc14b1230c762d445bd5cc561ae/listing/cb16c84f80c299a51b80e8952e143f3d4048d6c0in there i can see someone selling their cars for Bitcoin.
other that site you can go here :
https://www.bitpremier.com/2-autosi don't know it is legit or not,but it's possible to buy a car using 'Bitcoin' as a payment.
And some people already did it (might be)