YOU SAID:
Please let me know when I can get a new car
INTO JAPANESE
新しい車を手に入れることができる時期をお知らせください
BACK INTO ENGLISH
Let us know when you can get a new car
INTO JAPANESE
新しい車両を手に入れるタイミングをお知らせください
BACK INTO ENGLISH
Let us know when you're getting a new vehicle
INTO JAPANESE
新しい車両が届いたらお知らせください
BACK INTO ENGLISH
Let us know when you receive a new vehicle
INTO JAPANESE
新しい車両を受け取ったときにお知らせください
BACK INTO ENGLISH
Let us know when you receive a new vehicle
That didn't even make that much sense in English.