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Rear differential (4WD)
Checking or changing rear differential fluid Have rear differential fluid checked or changed by an Authorized Kia Dealer according to the Maintenance Schedule at the beginning of this section. ...

THE VERDICT
Kia won’t release pricing for the Optima for another few weeks, but we’re assured it will come in at under $20,000 to start and we expect it to undercut (slightly) the Sonata, which starts at ...

Power steering fluid
Checking the power steering fluid level With the vehicle on level ground, check the fluid level in the power steering reservoir periodically. The fluid should be between MAX and MIN marks on th ...