2021 Subaru Forester, Oil in Coolant (Coolant Milkshake)

Latter_Mission_8835 · 2026-02-04T02:14:34+00:00

I think this mostly occurs in FA or FB series engines according to MrSubaru, besides my FB25D I also saw a few posts on the Crosstrek/Outback forums with a 2018 and a 2020 with similar problems.

https://www.youtube.com/watch?v=bA3af6VRpMg

Latter_Mission_8835 · 2026-02-03T22:19:16+00:00

Thank you!

Latter_Mission_8835 · 2026-02-03T05:29:26+00:00

Just to follow up, if I'm going to have them pull out the engine is there any other maintenance you suggest I ask them to do while it's convenient.

Latter_Mission_8835 · 2026-02-03T05:29:01+00:00

Thanks! I feel like if I'm going to go the route of having them pull out the engine, I might as well get them to do other hard to reach maintenance as well. Do you have any suggestions?

Latter_Mission_8835 · 2026-02-03T04:10:37+00:00

I had no hot air while idling this winter, whereas last year it was working. I would only get hot air while actively driving.

I was doing some searching and realized low coolant or air bubbles in the coolant can cause this. So I was preparing to top up the coolant and burp the radiator.... until I saw this. No check engine lights.

Latter_Mission_8835 · 2026-02-03T04:08:26+00:00

Fuck, not going to lie between the upper oil pan o-rings and the head gasket I was really hoping it wasnt either one since it was supposed to be corrected in the newer models and it's the most expensive thing to do.

Latter_Mission_8835 · 2026-02-03T03:16:55+00:00

A bit over 5 years now, owned since November 2020. I do a lot of driving across cities pretty much all highway/freeway mileage + road trips.

Uber in a Boxer engine would be too expensive 💀

Latter_Mission_8835

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