2010 Malibu UOA Here's a report from my mom's 2010 Malibu. It has probably 80% city driving during this OCI. Filter is unknown, the quick-change special filter (so probably a Fram.. ick!). After the 1st sample on unknown 5W-30 from the quick change, now this PU sample at 8.7k, I think 12k is reasonable. One big question.... what do you think all the sodium is from? Test shows 0% antifreeze, but 100+ppm of sodium. What should I be checking? Thanks!