Take it from a retired Chrysler service manager that if you go 15,000 miles between oil changes and blow your engine you WILL have warranty problems and you can take that to the bank. Follow the owners manual at least for oil changes because you have to keep records. Personally I have changed my oil and filter every 3000 miles for over 20 years on all my vehicles and have put hundreds of thousands of miles on them and have never had any engine problems I have never used a synthetic even though at one time it was offered to me for free (wanted me to sell it in the shop ) but if you change your oil every 3000 miles IMHO you don't need a synthetic. One thing I can tell you with 100% certainty is don't use these oils in anything but your engine. If you do you will be eating whatever fails. The reason is it doesn't meet the factory specs
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