HUNDREDS of new cars damaged in last weekend's hail storm will be discounted at dealerships and auctions this weekend, with savings from $2000 to $20,000 expected.

General manager of Auto Auctions Shane Otten said about 300 vehicles would go under the hammer at Guildford today, with savings of up to $20,000 off the usual price.

Mr Otten yesterday said many of the vehicles, of various makes and models, will be sold regardless of reserves.

"There are cars that might usually have a higher recommended retail price, for example, the HSV Senator, usually $90,000 - that car will be in the vicinity of $70,000, (or) late $60,000s."

"It's a brand new car but damaged," the auctioneer explained.

Some diesel Toyota Land Cruiser four-wheel-drives are also expected to go up for auction today with $5000 to $6000 worth of damage to the panels.

But Mr Otten said 4WDs - that usually retail for $84,000 and currently have up to a six-month waiting list - will be sold for about $65,000.

Some dealerships in Sydney's north and northwest - including certain Ford, Kia, Nissan, Honda and Renault dealers - are also reducing the price of vehicles as a result of hail damage.

Cumberland Ford dealer principal, David Stevenson said the dealership had about 200 vehicles that were damaged, including the Fiesta and Focus and Mondeos, Falcons and Rangers.

"With the Falcon, the cheapest one is about $24,000, which would have been about $34,000 to $35,000 before," he said.

"Some are great buys, it depends exactly how much damage is done."

Mr Stevenson said the cars were still able to be insured, although this did not cover the hail damage.

Similarly, an NRMA Insurance spokesman said it would comprehensively insure hail-damaged vehicles, however owners would have to detail any pre-existing damage to the insurer, which would not be covered in the policy.

The NRMA Motoring and Services said that hail damage was normally superficial and did not affect the mechanics of the car, but advised people to be careful that the windows were