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Re: GTA Oil
There should be no real problems as same grade and both synthetic
It is preferable to use the same oil rather than changing mixing brands.
Why are you in the position of mixing oils?
I make sure I am not in that situation by suppling Castrol 10W60RS to my dealer at oil change. Reason is that for me Castrol 10W60 is easier to get than Selenia 10W60
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