Help about check up and parts :(

[Walter]

... and not all cars are designed for Iridium and Platinum spark plugs!

... that essentially is why the word "some" is in the sentence ...

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and yes, keep the oil for future use. bring them for the next pms. you can even mix it with other similar-use oils.

... it's not such a good idea to mix oils of different brands and viscosity ...