Originally Posted by Sadlers_1
So this engine is running on conventional oil. My 06' 300C 5.7L had always been synthetic. I've read numerous arguments on varying forums about the syn vs. conv oils. SO if the manufacturer suggests conventional now... Why spend more on synthetic oil? Why is it conventional now?
We also have the Unlimited Mileage/Time Warranty.
I know that a lot has been written about the superiority of synthetic oil. I'm not in a position to dispute it.
But, if the car manufacturers specify dino oil, that's what I use. My MDX said that you may use synthetic, but that using it should not extend the change interval.
I know it is sometimes an emotional subject with most, not all, basing their decision on what they read and sometimes perceived benefits.
Here is my 'guess'. When synthetics first came out they were a good idea, and they have continued to improve. At the same time, oil refining and additives, plus engine manufacturing has improved. At this point in time, conventional oil provides 100% of the protection and lubrication that an engine can benefit from. So while synthetic may look better on paper (and in all the ads) it is over kill.
Remember two things ...
1- I said this was my guess
2- Many people swear their low compression engines run so much better on premium fuel.
Use what makes you feel good. Your car won't care.