5 US manufacturing indexes all dropped in December, the 1st such across-the-board decline in 2 years.
Concerns about slowing global economic growth have dampened investor demand for riskier asset classes and pressured crude futures.
Savin had worked on his vessel for months in the small shipyard of Ares on France's southwest coast.
Oil has plunged more than 40% from a 4-year high in October on the prospect of a supply glut.
But in 2019, forecasters such as the International Energy Agency say emerging-market crises and trade disputes could dent global demand while rising non-OPEC production adds to supply.
Implied volatility for very bullish Brent options that expire after the Nov 4 resumption of sanctions has overtaken that for very bearish options, suggesting increased demand for such bullish bets.
Concerns over tightening supplies are growing as more buyers of Iranian crude shun purchases from the Islamic Republic before US sanctions take full effect in early November.
Crude oil prices could rise to US$90 per barrel by Christmas and to US$100 by the New Year as markets tighten.
Despite that, analysts say prices are curbed by a rise in refined product stocks and a relatively weak US peak fuel consumption season this summer.
A Bloomberg survey showed crude storage in tanks and terminals across the country likely rose 3 million barrels last week.