Last October I dumped the Quaker State Conventional 5w20 from my 2008 Ford Edge and put in Pennzoil Platinum 5W-20. The oil now has 5000 km (3100 miles) on it. Furthermore, the winter here has been very brutal so far and my vehicle has seen quite a few -35 C (-31 F) cold starts. I have been thinking about dumping this oil on the next fine day and putting in Quaker State Ultimate Durability 5W-20 for the remaining of the winter. Should I just leave it for another 2000 km or change it?
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