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Semi synthetic is not that great. I pulled the pan on my 9-5 with 55K miles and found 0 sludge. How you may ask? By using Mobil 1 every 5K miles.
The stop and go driving in that section of the country is brutal on engine oil with excessive stop and go . It also doesn't help matters that the catalytic converter is mounted under the oil pan(converters start to work around 600f). Also the PCV system on the four cylinder engines is suspect not allowing the motor to breath and remove condensation from the oil correctly.
posted by 205.128.0...
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