Recommended oil synthetic vs regular
Syn is all around better. If you have high mileage make sure to get high mileage syn.
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each oil change the swelling of the seals depending on the brand and formula. I use Mobil 1 only not "high mileage" even though I have 113K on my eclispe. watch for main or other seal leakage before just switching to a high mileage as your mpg will be less than the standard oil. I also run 5 to 7K between oil changes to reduce the cost of synthetics - tried the 15k oil but my mpg dropped after 7K just like the normal so not worth the extra cost
