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Hello and Welcome! I'm Billy and i will assist you with your inquiry. Feel free to ask if any further info is needed.
The oil you usually use is: mercury full synthetic 0W-30 is that correct (as you did not mention the W in your question)
Please confirm if this is not the case.
In case you are using the mercury full synt. 0W-30. Then you cannot use power steering fluid instead. However, you can use any brand, however you need to get the 0W-30 grade full synt.
Mobil 1 full synt. 0W-30 is recommended......but again any other brand, with full synt. 0W-30 oil would do.
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The system does not take engine oil, it takes mercury marine full synthetic 0 30 power steering fluid. Not sure why they have 0 30 rating on power steering fluid.
it takes power steering fluid, not engine oil
will royal purple mix with another synthetic, and operate the same?
Ok so it is 0 30 not 0W30.
In this case:
no, it does say sae 0w30,
You can use royal purple power steering fluid (full synt.)
How do you know that for sure?
Apologies for the delay, thank you for your patience.
The power steering fluid from purple would mix with other full synthetic fluids. Being also a power steering fluid (same grade), and also a full synthetic, confirms that it can be mixed or used in the place of the merc. fluid.
However, if still under warranty, Mercury would not accept this, and this would void your warranty, so be careful.
You're most welcome!