The petitioning dealership pays the Form I-129 fee and the statutory fraud-prevention and other surcharges in the USCIS schedule; premium processing is optional. Advisory fees are private and should be quoted separately.
Read the fee schedule as the employer, then decide what is optional
The petitioner is the U.S. dealership, and the government charges attach to its filing. The USCIS fee schedule (G-1055) sets the Form I-129 fee for the L classification and lists the additional statutory charges that apply to L-1 petitions, including the fraud prevention and detection fee and, depending on the petitioner's size and workforce, other surcharges.
Premium processing is a separate optional fee that buys a faster adjudication clock, not a better answer. None of these are refundable if the petition is denied because the manager turns out to be a supervisor, which is why the reporting-line analysis should come before any payment. Translations of Quebec payroll and corporate records are a private cost, as is the advisory work of assembling the file.
Ask the dealership to decide in writing whether the employee will bear any of these, and keep that agreement consistent with employment-standards obligations.