7MGE oil pressure problems

batmmannn · 07-07-2010, 07:08 PM

The Supra uses a low pressure high volume system and I also have read many places that the oil pressure guage is unpredictable and unreliable. I have read that using a Toyota brand oil filter instead of an after market filter can remedy this but I can't understand why. Many people hook in a better after market guage. I have heard of an oil filter blockage causing a drop in pressure. Mine dropped like yours and I was 3 quarts low and nearly disregarded the guage because of what I had read. I am monitoring my oil loss closely now. I have a Bosch filter on mine. After I added oil my pressure came back but it is very erratic at the guage, mine will start up and run at 40 then drop to 20, it's all over the place and makes little sense.

If it drops to Zero though you better stop and pull the dip stick.

I just found this in Google It recommends 10w 40 for my NA 87 Supra though I read that Cres recommendation of 0w30 used primarily in climates -40 below will get into your bearings and tight surfaces quicker at start up and flows like water even at these arctic temperatures. I am currently running 10w 40 but will switch to 5w30 after I find out why I am losing oil and fix it.

http://www.opieoils.co.uk/performanc...mmend_oil.aspx

07-07-2010, 07:08 PM	#7
batmmannn 12psi boost Join Date: May 2010 Location: West Virginia Posts: 320	Oil Pressure The Supra uses a low pressure high volume system and I also have read many places that the oil pressure guage is unpredictable and unreliable. I have read that using a Toyota brand oil filter instead of an after market filter can remedy this but I can't understand why. Many people hook in a better after market guage. I have heard of an oil filter blockage causing a drop in pressure. Mine dropped like yours and I was 3 quarts low and nearly disregarded the guage because of what I had read. I am monitoring my oil loss closely now. I have a Bosch filter on mine. After I added oil my pressure came back but it is very erratic at the guage, mine will start up and run at 40 then drop to 20, it's all over the place and makes little sense. If it drops to Zero though you better stop and pull the dip stick. I just found this in Google It recommends 10w 40 for my NA 87 Supra though I read that Cres recommendation of 0w30 used primarily in climates -40 below will get into your bearings and tight surfaces quicker at start up and flows like water even at these arctic temperatures. I am currently running 10w 40 but will switch to 5w30 after I find out why I am losing oil and fix it. http://www.opieoils.co.uk/performanc...mmend_oil.aspx __________________ 1987 N/A 7MGE Left Hand Drive MK3 Red 5 Speed and Black Auto Supras My Next project is the Batmobile! Last edited by batmmannn; 07-07-2010 at 07:29 PM.