Winterization - Antifreeze Question...please help!

[wakescene]

Hi all,
I am getting ready to winterize my 2001 MC 210VRS. My question involves the Antifreeze.

Currently we are talking about a 2001 210VRS. I have the LTR motor with Closed Cooling.

I understand that the RV Antifreeze is not recommended for the Aluminum heads on my motor, and I would not be putting this into the motor as it already has Closed Cooling right now, with a mixture that is good for -25degrees (tested this last night).

Can I use the RV Antifreeze for the raw water system?
- OR -
Because I have a Closed Cooling system, can I jsut drain and blow out the raw water system and leave it at that?

Any advice is appreciated.
Thanks,
KG

[peason]

I would think you just need to drain the fresh water system and that should be it. I doubt you need to mess with the closed system. What does the owner's manual say?

[Tom023]

If you have an LTR you don't have aluminum heads. Is it the LT-1?