1989 300te.
1.The oil light now goes on every so often...stays on, then, when it wants to, goes off. At rest, the car has enough oil. Can this be a filter issue? It needs to be changed. If not...then what?

2. My steering is getting heavy. Tire pressure checked...OK. I don't know why, but I am thinking steering pump, because it feels as if I am losing 'power steering'. There is fluid in the system...checked. How would I diagnose this?

Try this first

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2AO123CS42C90UZQ2B&year=1989&make=MB&model=300-TE-001&category=M&part=P%2FS+Filter

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A Dalton

[QUOTE=Arthur Dalton;1815915]Try this first

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2AO123CS42C90UZQ2B&year=1989&make=MB&model=300-TE-001&category=M&part=P%2FS+Filter[/QUOTE
What is this? What does it do? Where do I put it?

[QUOTE=Eliot;1816024]HUH ??

Well, as it says in the item discription, it is a P/S Filter .... so..I guess it filters the P/S fluid... and it goes in the P/S reservoir ..and if it is clogged, it may effect your Power Steering.
I would also check the belt tension..that would be the belt that drives the power steering pump.

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A Dalton

[QUOTE=Arthur Dalton;1816029]Sorry, I was hung up on the oil filter, and had a brain-fart...Of course..P/S=Powersteering. Thank you.