I have been using the Mag1 5W-30 FS for two changes already, 15K and 25K. I have not encountered any problem with the oil. When I changed, I put a sample in a clear container and marked it. The oil still seems to move freely inside the container. Though an oil analysis test would tell us the condition of the oil, it is not my priority as of the moment. A gallon costs P1,505.00


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