I have a 2008 Honda Fit and in the manual says "Honda doesn't recommend using synthetic oil".

I want to know why, as I can't find the answer online. Seems like any car can use synthetic, why mine says it shouldn't?

I'm using a semi synthetic by Shell as recommended by my mechanic, but I think I will switch to mineral by Honda next change.

  • WE DON'T RECOMMEND synthetic oil for use in our engines. DO NOT USE synthetic oils in our engines. These 2 statements above mean different things.
    – Gus
    Jul 29 '19 at 15:36

That statement "usually" means that they have not chosen a preferred supplier...

I used a top quality fully synthetic oil in a diesel that had a turbo added and it was fine, the engine, did not have a synthetic specified either, especially as it came from a Nissan and was fitted into a Volvo...

If the synthetic matches , or exceeds, the specifications for the engine then it should be fine.

  • 1
    The last sentence says it all. If the oil meets or exceeds the API service and Group specifications from the manufacturer you should be OK. I have no idea why they would recommend dino oil exclusively.
    – Tim Nevins
    May 23 '18 at 16:29

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