I run castrol 10w 40.
The car likes the 10w 40 over the 30.
So that's what I feed it.
Hybrid oils half this and half the otherr are ass in my opinion.
If you want to run synthetic. You should buy a NEW car and start it on that immediately.
Because, yes it will either leak or smoke. You don't change horses midstream.
And that's really what you are doing with 123kish on the engine.
Stick with conventional and don't mix oils either.
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