2008 v70 steering worse and now whining after oil change

[vtl]

Likely. But it's a mix now, you need to replace it all. It will get worse with temperature going down.

[swimNdrive]

There are well documented processes on internet, this forum an others, for flashing the steering fluid for Volvo cars. They are pretty much the same. It is not a difficult job once you know the steps involved. I am sure your engineer will be able to search those information and do it again properly.

[Magnus308]

Your engineer probably forgot that two different fluids have different density, kinematic viscosity, etc. He did it totally wrong, no wonder that car complains as it is faced to cavitation effects in steering pump.

The whole system needs to be flushed, not just oil tank.

It does not matter in this case, Those 2 fluids is totally compatible with eachother and can be mixed i have checked their tech spec.
The cSt values are almost the same and even if it was a small difference it would not affect the function of the system.
To mix 2 oils with different cSt values does not create cavitation

[vtl]

I don't know. When I replaced steering pump on 2002 V70, it came (from junk yard) filled with ATF, I didn't flush it out. Such small quantity of different fluid was enough for pump to start whirring hardly. Used almost 2 liters of OE fluid to flush the whole system and fix the problem. No problem since that.

[John I white]

Hi All,
The brother-in-law fixed it yesterday.

- He starts the engine with the reservoir lid off.
- The fluid drains down.
- Airlocked fluid foams up to replace it.
- Switch off engine.
- Wait for bubbles to clear

Restart engine - the now bubble-less fluid drains down, repeat. Many times.

Eventually the air is cleared and the car is running perfectly.

He suspects that ideally, it's never necessary to fully replace the fluid. It just gets topped up when necessary. That seems to be what the dealer does when they service it.

Regards,
John