The phrase "sleek car" is correct and usable in written English.
You can use it to describe the appearance of a vehicle, for example: The Mercedes Benz parked outside the cafe had a sleek, black finish.
I have been driven by Hamilton in his huge, sleek car.
This is a ridiculously sleek car; the shape doesn't merely cut through the air but slices it into fillets.
At Lift, the flotation tank looks like a cross between a sleek car top carrier and a huge bidet.
Mondrian seems present (along with Mr. Prince) in Mr. Dibbets's "Colorstudy" pieces, each consisting of a group of four close-ups of sleek car hoods.
I was some five minutes from home when this huge and very sleek car overtook me illegally on the inside, travelling at, oh, around a thousand miles an hour.
In a 1946 cartoon by Alan Dunn, we see an impressive and sleek car body being fitted over a rickety old jeep: life at the time may have looked bright and shiny on the surface, but underneath there were still engine problems.
It has been replaced by the sleek car-service sedans that collect McIntyre each weekday morning at his Potomac home and squire him to his downtown Washington brokerage office.
Occasionally someone's dog or cat that lacked sense or agility was crushed beneath one of their big, sleek cars.
WASHINGTON — Military spending has transformed the faded farmlands of northern Virginia into a land of glass-block office parks, oversize homes and sleek cars.
He was soon seduced, he said, by the flash and dazzle of the neighborhood wiseguys, with their sleek cars, glinting rings and glittering women.
There will be sleek cars on display at the kickoff event featuring Anita Perry, the state's first lady, who will talk about the economic impact of Formula One.
