Toyota is repairing more than 1.6 million vehicles around the world, including the US and Japan, for potentially leaky oil hoses — the latest in a spate of quality problems battering the world's biggest automaker.

The fix affects 1.3 million vehicles in North America, including repairs that have yet to be officially announced on 100,000 Highlander crossovers and 215,000 Sienna minivans, Toyota Motor Corp, spokeswoman Ririko Takeuchi said Tuesday.

Repairs on 45,000 vehicles in Japan have already been rolled out since October. The problem affects an additional 230,000 vehicles in 90 other nations, Takeuchi said. The models involved in Japan are the Harrier luxury model, Estima minivan, Blade hatchback, Mark X Zio sedan and Vanguard crossover.

Toyota does not consider the latest repair a recall because the problem doesn't endanger safety, and categorizes it as a "service campaign," with owners receiving notices through dealers about the needed repair.

"This is a routine measure," said Takeuchi. "We are not hiding anything.”