The KBA transport authority recorded 298,002 new cars on the road in September, an increase of 9.4 per cent over the same month in 2015.
September's figure follows a big increase of 8.3 per cent reported by the KBA in August.
"Extremely low interest rates are making it possible for dealers and manufacturers to put together very attractive packages and attract more private customers," Ernst & Young partner Peter Fuss said.
A study from the German CAR research institute showed a high level of discounts on new vehicles in September, with sales prices around 18.5 per cent below list prices.
Businesses' wariness "could be a sign that the peak of the new-car boom in Germany will soon be reached," Mr Fuss continued.
In a statement, president Matthias Wissmann of the VDA carmakers' association stuck to forecasts of 3.3 million cars registered over the whole of 2016, "the highest sales in seven years".
That put this September's figure 1.7 per cent higher than the same month in 2015, at 58,000 vehicles.
Over the whole year to September, VW's sales remained 1.0 per cent lower than last year.
BMW-owned Mini and Daimler flagship Mercedes were the fastest-growing German carmakers, increasing sales 35.3 and 26 per cent respectively.
Among foreign carmakers, California-based Tesla saw sales of its electric cars increase by 183 per cent -- but in absolute terms sold just 377 vehicles, a market share of 0.1 per cent.
Between them they accounted for 1.1 per cent of new registrations.
Berlin this year introduced subsidies for both types of cars as part of a drive to reduce carbon emissions by encouraging electric driving, so far to little effect.
A total of 2.56 million cars were sold from January to September, or 6.1 per cent more than over the same period last year.
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