I'm working on a 200 Volvo V70-XC. 96K miles. It's acting like there
might be an oil pressure problem. Here's the story:
After a recent oil change, the oil warning light on the dash starts to
light on startup, goes out as soon as the revs are anywhere above
idle, then stays out during driving, only to come back on during
braking and at idle. Braking downhill seems to cause it to light
earlier. Weird.
I replaced the oil pressure sending unit, which seems like the most
obvious thing to do. The oil change guys installed 5W-30 motor oil,
which appears to be the spec for this engine. The oil level on the
dipstick is correct. Experience tells me that this car "shouldn't"
have anywhere enough miles on it -- given basic service -- to allow
bearing wear that would be significant enough to affect oil pressure.
Volvo engines are supposed to be able to run 300K miles without
problems.
Should I try using a heavier weight oil? Could it be that there's
another sender/sensor connected to the oil light? I can't find a
decent manual on this car, as apparently Haynes didn't write one for
the 1998-200) V-series.
Any ideas or thoughts much appreciated!
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