Yeah, always change the oil and antifreeze when doing the LIM/UIM job, regardless if they mix or not, I'd not even drive the car again until this is done, better safe than sorry, especially since changing the oil/oil filter, and antifreeze is not that costly.

As for rotors, I always tend to go AC Delco, but if the car is just a daily driver, then you could get RAYBESTOS 56325R, they are like 24.00 from Rock Auto.

The ones I prefer are almost double the price, but if they are affordable they are what I'd go with.
ACDELCO 18A559

I'm on the fence about the rotors, thinking maybe even though it'* only a daily driver that the driver must be a little hard on brakes to have gone through 2 sets of front rotors already @ 50K mi.

I was looking at the CENTRIC 12062050 Premium rotors at $37/ea. on Rock Auto, are they about the same or not as good as the ACDELCO 18A559? Centric makes a lower end C-Tek $22 rotor too so I thought the 12062050 might be a step up.

I already changed the coolant, figured I'd better do that first because it was full of almost straight water and temperatures are dropping fast, supposed to get down to 4F tonight.

There wasn't any coolant in the oil but it'll be changed before it'* driven again.

I have never used Centric'* before, so I cannot say if they will be good enough or not.
Are the rotors getting any irregular wear patterns on them?
Something has to be wrong if they are going through them that fast, maybe they are just hard as hell on the brakes...
AC Delco are the best that I have ever used personally, worth the money IMO.

Yes it seems hard on front rotors. Last time I put new ones on, the old had concentric grooves and felt like there were high spots or warping when braking. They were slightly glazed looking but I've seen worse.

The replacement rotors lasted through one set of replacement pads but it'* looking like a new set of pads every 12K mi. and new rotors every other pad swap. Then again it doesn't get a lot of highway miles, rather shorter trips, mostly stop and go driving with a driver that doesn't appreciate coasting up to a stop sign or light.

I could've sworn I had some rotors in a cart at Rock Auto and they'd listed $16 */H but now they want $25 */H which is starting to get expensive for a 19 y/o car even though it'* otherwise in great shape now. I got some ACDELCO 18A559* at Amazon instead, about the cheapest I could go and still get name-brand.

Are these the ones you got?

If so those are the ones I put on my Park Ave in 2012, I don't drive a lot daily, but mine have lasted considering the little I do drive, they have held up nicely.

No I ordered these: https://www.amazon.com/gp/product/B0031I0NEQ
They were a couple bucks cheaper too.. gotta love Amazon'* dynamic pricing.

Oops, I put an "*" on the end of the model # a post back instead of "A"... It was the Raybestos that have an * added and look like the same thing under a different name, both made for BPI Inc.

Ahhh ok, that explains why I could not find that model.
Decent rotors for the money.