Just had a question for you folks. When is it ok to change out the old dino oil and replace it with synthetic? I just changed our oil at about 10,000 miles, second change, and wonder if I should look at putting synthetic in when I change out at around 15,000 miles. Ran synthetic in my old GMC D/A combo from about 15,000 miles or so until trading it at 103,000+-.

When our D/A was new, I dropped the original oil at 5K and went full synthetic. Don't know if it is 'better' than dino oil for my truck, but it makes ME feel better.

I think you're fine to switch anytime.

It might not give more life but it can be done when you are ready. I lean to synthetic but have not read proof or even near proof it was functionally better in the real world in real time. Some say even new dino has a lot of synthetic in it to pass newer specs. I know there is not a huge price difference in cost per mile today and one reason I lean towards synthetic just in case it helps. :)

Mobil 1 has a very good website. They claim the change can be made at any time. When I bought my Cummins, the Cummins tech center said that with diesels it wouldn't really make much difference since the oil reserve is so big. They said it would definitely help with a gas engine since synthetic dissipates heat much faster. They also strongly advised against extending oil change times.

Synthetic Oils | Good Sam Community

74 Replies

2oldman
Explorer II
Sep 13, 2013
How stuff works: synthetic oil
Gale_Hawkins
Explorer
Sep 13, 2013
It might not give more life but it can be done when you are ready. I lean to synthetic but have not read proof or even near proof it was functionally better in the real world in real time. Some say even new dino has a lot of synthetic in it to pass newer specs. I know there is not a huge price difference in cost per mile today and one reason I lean towards synthetic just in case it helps. :)
ib516
Explorer II
Sep 13, 2013
I think you're fine to switch anytime.
downtheroad
Explorer
Sep 13, 2013
When our D/A was new, I dropped the original oil at 5K and went full synthetic. Don't know if it is 'better' than dino oil for my truck, but it makes ME feel better.

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Synthetic Oils

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