I recently bought a 91' 190E (160K MILES) with a 2.6 engine. The oil indicator light started coming on and off after about 2 weeks so I went and did an oil change. The car ran well for another two weeks and the light has started coming on and off again and seems to be staying on longer now. Any suggestions and also any advice on doing an oil change...pump the oil out of the dipstick or drain??

 

the oil level is fine?

the oil pressure is fine?

 

Yeah the pressure is fine and the oil level is half full on the dipstick. I guess, my question is whether to keep filling it every time the light comes on or not be too alarmed.