Jan.18 (GMM) Ralf Schumacher is likely to switch to Germany's DTM series in 2008 after declaring himself happy with a two-day test at Estoril.

The 32-year-old German, who lost his Toyota seat at the end of 2007, completed more than 100 laps of the former Portuguese grand prix circuit this week in a black Mercedes-Benz C-Class.

"The cars are really cool to drive," Schumacher told Bild newspaper.

The German publication asked the winner of six grands prix if he will race in the premier touring class category this year.

"You should also ask (Mercedes competition boss) Norbert Haug," Schumacher smiled.

"We will get together next week and talk about how we go ahead together," he added.

"The fact is, I really had a lot of fun. These cars are good in the high speed corners, which is not what I previously thought, and the engine is at a really high level."

He also welcomed Haug's comments that he logged competitive lap times throughout the test on Wednesday and Thursday.

Schumacher laughed: "What did you think, that people had been paying me (in F1) for nothing?

"Seriously, although the times were okay, to go completely to the front would need a lot of hard work," he added.