Oil weight general question

Reply

  #1  
Old 06-28-05, 03:03 PM
peter88
Visiting Guest
Posts: n/a
Oil weight general question

Have a 87 Mustang 4 cyclinder with 102K miles. When idling, oil pressure gauge drops down close to 0 but goes up after moving again. Pressure is higher when first starting the car. Is it posible to use different weight oil on older vehicles? Why does pressure drop on older vehicles?

Also have rumbling vibration from the engine when first starting the car but just when putting it in reverse. After it's warm, problem goes away in reverse. Just had the trans rebuilt and took it back. They said the trans is fine and even tried a different one but it didn't help. Not sure what to think.

thanks for the help
 
Sponsored Links
  #2  
Old 06-29-05, 04:56 AM
Member
Join Date: Dec 2001
Posts: 2,538
pressure can drop from a couple of different reasons one possibility is that the oil pump is getting worn and unable to put out adequate pressure.
the other possibility and probably the most common reason on vehicles with some mileage on them is excessive bearing clearances as the clearances in the engine bearings get wider from wear it will lower the pressure as their is less restriction to oil flow and in this case changing the oil pump doesnt usually help the problem at all.
you can use a different weight oil but even a heavier weight oil will not make much of a change in oil pressure on a fully warmed up engine, but could affect the pressure by a couple of psi.
check exhuast.
 
  #3  
Old 07-01-05, 01:08 PM
hspr's Avatar
Member
Join Date: Jun 2005
Location: Ontario, Canada
Posts: 106
You should first check the pressure sender. A shop can hook up a pressure guage in its place or you can just go ahead and replace it. It shouldn't be too expensive. Not to say your engine concerns aren't valid, but nine times out of ten it is the sender, especially if the engine runs okay otherwise and isn't using oil.
 
  #4  
Old 07-04-05, 11:44 AM
peter88
Visiting Guest
Posts: n/a
Will give it a try, thanks for the info.
 
  #5  
Old 07-04-05, 06:11 PM
Member
Join Date: Aug 2003
Location: Cape Cod
Posts: 4,320
A common complaint from this vintage Mustang
Ford addressed the problem in later models and eliminated the complaints
They installed a gauge (sender actually) that read normal no matter what the oil pressure actually was
No kidding


You should check it to be sure, but here's a good chance it's the sender
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes