2005 Chevy Malibu Maxx lt v6 3.5, 145,000 miles. Lots of city stop and go driving. Anyway I have been talking to a rep from liqui moly about oil recommendations, he told me to use 5w40 in my car since it's higher mileage even though it calls for 5w30. Also he said it wouldn't hurt my oil seals to switch from using a non high mileage oil, the people at pennzoil also said this. Do both of these sound right? Thanks.
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