Investors should use the latest bout of market turmoil to accumulate stocks in the Japanese stock market, according to Peter Oppenheimer, the chief global equities strategist at Goldman Sachs.

Plagued by low inflation for decades, Japan's economy is now seeing improvement for the first time since the 1980s, Oppenheimer told CNBC Tuesday. This, he said, meant that the attractiveness of equity valuations in the Asian country contrasted with their American counterparts.