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?