Top Indian automakers on Friday posted an increase in passenger and commercial vehicle sales for August, as optimistic dealers loaded up vehicles ahead of the festive season.

In the passenger vehicles (PV) category, sales for Maruti Suzuki and Mahindra and Mahindra grew 16.4 percent and 25 percent, respectively, for the month compared to a year earlier. Tata Motors, however, posted a 3.5 percent decline in PV sales.

Shares of Maruti Suzuki scaled to a record high during the day. The automaker reported total sales of 189,082 units in August, its highest ever monthly sales volume, led by continued strong demand and launch of new models in the fast-growing sport-utility vehicles (SUV) segment.

Two-wheeler maker TVS Motor Company reported a 5 percent increase in sales, while Bajaj Auto registered a decline of 31 percent. Eicher Motors' total motorcycles sales grew 11 percent.

Two-wheeler sales provide a glimpse of the financial health of India's rural economy and demand in the country's largest consumption segment, which mostly comprises of lower middle-income households.

"Medium and heavy commercial vehicle segments are holding very strong, while passenger vehicles have started showing good traction after a pause," said Amit Hiranandani, automobile sector lead analyst at brokerage SMIFS.

In general, August and September are inventory-filling months, with wholesale numbers looking reasonably good as most dealers are optimistic across segments due to upcoming festivals, he added.

In the commercial vehicles (CV) segment, sales volumes for Eicher Motors' trucks and buses climbed 30.4 percent year-on-year in August.

CV sales for Ashok Leyland and Tata Motors rose 9 percent and 4.9 percent, respectively.

However, Escorts Kubota said tractor sales - indicative of demand in the rural economy and the state of farm incomes - declined 2.1 percent in August, partly due to deficient monsoons.

The Nifty auto index settled 1.65 percent higher after the data was released.