Prepping for a home service

Hi Guys, new member here from Norway.

I'm getting ready to do a lot of work on my 2012 Prius plus7 or V or whatever its called and want to make sure of a few things.

I'm replacing the slide pins on the rear brakes, they are very stiff and the price of new ones isn't too bad. I've already replaced the pads and discs so this is straight forward. I've also got a kit for the front (pins, pistons, rubbers etc) as the front has given me some trouble over the last year or so. With the videos i've seen from nuts about bolts this all seems pretty straight forward.

I'm also changing the oil and filter, any suggestions on the oil viscosity? it gets pretty cold here in the winter (down to -30c/-22f at times)

I also want to change the spark plugs and possibly the coils. I've had the knocking on start up occasionally so while its all apart i think it would make sense to swap them out? Any recommendations for spark plugs?

While every thing is apart i might as well do the intake manifold clean and EGR pipe clean also replace the PCV valve as its a cheap part and easier to get at at this stage.

I'll drain the coolant system as well and refill, is it worth doing the inverter coolant as well? I have no idea when or if this has ever been changed. What fluid is used in there?

Lastly, I think, the transmission fluid. Again I have no idea when this was last done. The manual states toyota genuine ATF, is there anything better or stick with this?

Air filter and cabin filter

Is there anything else you would recommend doing while i'm at it? I want to get as much done myself to keep the costs down at the workshop.

 

It’s coming up to 125k miles now. Somethings are long overdue, I’ll take a look at cleaning the EGR as well

 

The nuts and bolts videos are great and have given me the confidence to do a lot more work than I would have tried otherwise

 

Thanks a lot, that will be some very useful info