Adding Prestone All Vehicle coolant to mostly-drained Toyota Super Long Life coolan

[jessesYaris]

To flush or not to flush (with distilled water)?

Just read a few threads "mixing/contaminating" coolant and I'm curious what I should do here.

2008 yaris still has original (been topped up a few times) toyota red coolant in it.

Bought some unmixed prestone "all vehicle" coolant to replace it. It's ethylene glylcol based, same as toyota red.

The plan is to drain it from the petcock and then fill with the prestone after mixing it 50/50 with distilled water.

Just curious if I should flush the system with distilled water first before doing that?

Thanks guys.

[bronsin]

I think I asked you this before but I forgot. How many miles on your Yaris?

I think most people here would say Toyota red coolant is the best. Also the Toyota air filter is the best. I wouldn’t use anything else!

Having said that, go ahead and flush and use the pretone

[bronsin]

Also, did you buy this vehicle new?

[jessesYaris]

There's 173k kms on it.

I bought the vehicle new yes.

The manual does say that any equivalent coolant is fine so it should be ok to mix them. Will report back if car blows up.

[bronsin]

There's 173k kms on it.

I bought the vehicle new yes.

The manual does say that any equivalent coolant is fine so it should be ok to mix them. Will report back if car blows up.

I predict success.

:thumbsup:I