Kimi Raikkonen completed a successful first pre-season test for Ferrari by setting the pace on the final day at Spain's Jerez track.
It is the third time in four days a Ferrari has been fastest, as the teams reached one-third distance in their preparations for the 2015 season.
Sauber's Marcus Ericsson was second ahead of Lewis Hamilton, whose Mercedes team completed by far the most mileage.
McLaren had another tough day, still struggling with their new Honda engine.
Jenson Button did only 35 laps and was 6.8 seconds off the pace as he was hit initially by a problem with oil levels and then was forced to abandon the day's running following a fuel-pump failure.
McLaren posted 79 laps over four days - compared to more than 500 by Mercedes. But director of engineering Matt Morris insisted the team had had a positive test as they bedded in their relationship with Honda.
"We have had a number of problems," Morris said. "We have had some operational issues - all of us working together as a team for the first time - things you take for granted when you have been with an engine supplier for many years.
"You drop the ball sometimes, like saying getting oil levels wrong and all these sorts of things. We have had a few issues like that.
"We have also had some minor electrical issues, which resulted in a lot of downtime but have actually been relatively easy to fix.
"The main thing is that we have not been burning bodywork or blowing up engines.
"I am pretty happy that we are going to come out of this test with no major issues to resolve."
Hamilton had a harmless spin at the chicane in the morning but still managed 117 laps as Mercedes completed an impressive overall distance of 1,419 miles in four days.
Hamilton told his team over the car radio: "Well done, guys. Great first week back."
On his spin he said: "It was a bit damp, I was the first on slicks, so I just had a spin.
"But reliability has been pretty special this week. It's one of our highest weeks of mileage.
"The car feels very similar to last year. It's very difficult to pick out any differences, really."
Lotus also had an encouraging final day as they completed their first test with a Mercedes engine, after switching from Renault last year.
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