Company: PBR
Filing Date: 2025-05-28
Form Type: 6-K
Source: 0001292814-25-002253
Chunk: 0

Company: PETROBRAS - PETROLEO BRASILEIRO SA
Filing Date: 2025-05-28
Form: 6-K
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private
Issuer
Pursuant to Rule 13a-16 or 15d-16 of the

Securities Exchange
Act of 1934

For the month of May, 2025

Commission File Number 1-15106

PETRÓLEO BRASILEIRO S.A. – PETROBRAS

(Exact name of registrant
as specified in its charter)

Brazilian Petroleum Corporation – PETROBRAS

(Translation of Registrant's
name into English)

Avenida Henrique Valadares, 28 – 9th floor
20231-030 – Rio de Janeiro, RJ
Federative Republic of Brazil

(Address of principal
executive office)

Indicate by check mark
whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ___X___ Form
40-F _______

Indicate by check mark
whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission
pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes _______ No___X____</div>

Petrobras starts operations at the new Diesel Hydrotreatment Unit at Replan—

Rio de Janeiro, May 28, 2025– Petróleo Brasileiro S.A. – Petrobras announces that it has started operations at a new Diesel Hydrotreatment
Unit at the Paulínia Refinery (Replan), in São Paulo. The operation began three months ahead of the date originally scheduled
in the feasibility study, and the project was executed within the approved investment level at the time.

With the start-up of the new unit,
Replan increases its production capacity of S-10 diesel by up to 63 kbpd (thousand barrels per day) and jet fuel by up to 21 kbpd. This
expansion prepares the refinery for the phase-out of S-500 diesel (500 ppm sulfur), enabling the complete conversion of its diesel production
to S-10 diesel (10 ppm sulfur). Additionally, this conversion brings environmental benefits, improving the plant’s energy efficiency
and reducing sulfur compound (SOx) emissions from the fleet, which will now use S-10 instead of S