Ive been running mobile one Syn 5W-30 since I hit 2,000k. My car runs like it did when it had 20 miles on it. Im at 35K now. When I did my first oil change I just drained the stock oil out, and dumped in the mobil one. Ive had no problems. I also use a bottle of synthetic fuel injection cleaner every oil change.
In regards to ur post, I honestly dont know the true advantages/disadvantages. I just jumped on the syn bandwagon with everybody else. I do think alot of what u hear is/are myths tho.
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