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My oil has been changed twice by 2 different Dodge dealers(3.7L). The first one charged me around $33.00 and used 5w-30. The 2nd charged me $57.00 for 5w-20 (synthetic). I was told that the high cost was due to my truck requiring synthetic. My questions are: Do I have to use the synthetic 5w-20. 2nd question is - I do mostly hwy driving. Do I really need to have my oil changed every 3000 miles?
 

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From what I've read you don't want to be changing back & forth from dino oil to synthetic & then back to dino. Synthetic is not a requirement on the 3.7, but you can get tons of recommendations for it. And usually the recomendation says to change sysnthetic oil only every 5000 - 6000 miles. So yes, it's more expensive, but you do it 1/2 as many times.

This is my first new car. And I'll probably go synthetic in it.
 

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First your manual says to use 5w/20, not 5w/30 , if you go to a good syn oil stick with it like keeping the cholesterol down in your engine & like AirJunky said extend your drain intervals.:beerchug:
 
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