Thank you both for your advices.

The Pattern was rev and cut, then rev and cut continuously, this only happened when I was at a speed of about 120-130 kmph, the rpm was about 5000, maybe a little higher, I tried kickdown at night, so I didn't see clearly what the rpm was, but definitely it was very close to the redline.

I have also tried kickdown at low speed, at 30-40 kmph, I could slip rear tires and didn't see any problems.

I really hope this is caused by the rev limiter, but why does the limiter kick in so violently, and doesn't allow the transmission to upshift and maintain acceleration?

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99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.