Howdy,
I just picked up a beautiful '90 350SDL.
To start off,
I am a refinery millwright and I do all the maintenance on my other cars,
'91 Volvo 240 and '87 Chevy Blazer full size.
Also,
I have already read a lot of posts on other sites and blogs and I know about the "Rod Bender".
This one has 170 K so it would be a pretty good guess that it has either already been recalled or fixed.
Back to the Mercedes,
I have a little problem,
The power steering works fine when she is first started but quits altogether when the engine comes up to temperature.
So,
I have to assume that I am having a viscosity related problem.
Either the fluid that is in the car has a lower viscosity then the Mercedes fluid and it only takes a little heat to make it loose its hydraulic properties.
Or,
There is another component, steering pump or steering box that has worn to the point that the fluid is able to bypass and return to the reservoir.
That said,
I am going to start off with a new filter and a complete flush and replacement of the fluid.
Now the question for the group,
I have already speck'ed out two oils that are available locally.
Bilstein Febi 08972 and Pentosin CHF 11S.
And I have located one oil from Redline that is a higher viscosity hydraulic oil.
Anyone have a suggestion either pro or con to the Bilstein or the Pentosin oil?
And assuming that changing the filter and oil,
Anyone had any experience with the Redline High Viscosity oil?
Of course if nothing else is successful I will end up swapping out either the pump or gearbox.
Anyone have any suggestions on diagnosing which is not working?
Thanks in advance for your help and the opportunity to pick the brains of some of the 350SDL owners in the group.
Sarah_Dippitt