7MGE oil pressure problems

I h8 Hondas · 07-07-2010, 03:32 AM

I live in northeast Missouri but I'll be going to college down at Rolla.

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

cre · 07-08-2010, 02:41 AM

Man, keep reading....

cre · 07-08-2010, 02:45 AM

Oh, and as for the oil gauge... there's nothing wrong with the stock oil pressure gauge. They're not renown for failure either. The SENDER however is known for being inaccurate as far as calibration goes and it is internally dampened causing a significant delay in report. If you've got bouncing readings check the wiring and connector... it's unlikely that the gauge or the sender is at fault.

If anyone ever adds an aftermarket oil gauge do keep in mind that you still need to leave the stock oil pressure sender in place and connected as the ECU does read it... you may remove the stock gauge from the cluster though.

cre · 07-08-2010, 04:22 AM

God... I can't get away from this thread... just saw the Toyota filter thing. Toyota's old filters were VERY well constructed, but today's filters are a poor comparison. Filters such as Wix (NAPA Gold), Mobile1, K&N and PureOne are much better filters.

CanadianBak'inSupra · 07-08-2010, 07:33 PM

Quote:

Originally Posted by cre

God... I can't get away from this thread... just saw the Toyota filter thing. Toyota's old filters were VERY well constructed, but today's filters are a poor comparison. Filters such as Wix (NAPA Gold), Mobile1, K&N and PureOne are much better filters.

i have a filter from toyota in a red box its plastic wrapped and the gasket is pre lubed, is this a new or old toyota filter?? either way im gona use it so it really doesnt matter...

batmmannn · 07-08-2010, 10:13 PM

Not sure I can get those here but we do have a NAPA. Didn't make much sense that a Toyota filter would change the reading. Yes my sender is in question. Reminds me to go check my oil level. I just crossed the 100 mile mark on the tripometer.

cre · 07-09-2010, 01:20 AM

ALL filters cause a change in pressure. Pressure == resistance to flow.

There are much worse things to run than the newer Toyota filters, but they're not very good and you can get much better for close to the same price. I don't remember how to tell the difference other than taking them apart. The old style used a varied density foam-like medium and the newer are paper. They haven't been available in North America for some time so unless it had a half inch of dust on the box when you picked it up it's unlikely it one of the famous ones... it's a shame too because they were supposed to be VERY good filters.

Anyone here uses a FRAM and I'm coming to get ya!

07-07-2010, 07:08 PM	#2
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.

07-08-2010, 02:41 AM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Man, keep reading.... __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

07-08-2010, 02:45 AM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Oh, and as for the oil gauge... there's nothing wrong with the stock oil pressure gauge. They're not renown for failure either. The SENDER however is known for being inaccurate as far as calibration goes and it is internally dampened causing a significant delay in report. If you've got bouncing readings check the wiring and connector... it's unlikely that the gauge or the sender is at fault. If anyone ever adds an aftermarket oil gauge do keep in mind that you still need to leave the stock oil pressure sender in place and connected as the ECU does read it... you may remove the stock gauge from the cluster though. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

07-08-2010, 04:22 AM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	God... I can't get away from this thread... just saw the Toyota filter thing. Toyota's old filters were VERY well constructed, but today's filters are a poor comparison. Filters such as Wix (NAPA Gold), Mobile1, K&N and PureOne are much better filters. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

07-08-2010, 10:13 PM	#7
batmmannn 12psi boost Join Date: May 2010 Location: West Virginia Posts: 320	Oil Filters Not sure I can get those here but we do have a NAPA. Didn't make much sense that a Toyota filter would change the reading. Yes my sender is in question. Reminds me to go check my oil level. I just crossed the 100 mile mark on the tripometer. __________________ 1987 N/A 7MGE Left Hand Drive MK3 Red 5 Speed and Black Auto Supras My Next project is the Batmobile!

07-07-2010, 03:32 AM	#1
I h8 Hondas Stock Join Date: Jul 2010 Location: Bethel, Missouri, U.S. Posts: 12	I live in northeast Missouri but I'll be going to college down at Rolla.

07-09-2010, 01:20 AM	#8
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	ALL filters cause a change in pressure. Pressure == resistance to flow. There are much worse things to run than the newer Toyota filters, but they're not very good and you can get much better for close to the same price. I don't remember how to tell the difference other than taking them apart. The old style used a varied density foam-like medium and the newer are paper. They haven't been available in North America for some time so unless it had a half inch of dust on the box when you picked it up it's unlikely it one of the famous ones... it's a shame too because they were supposed to be VERY good filters. Anyone here uses a FRAM and I'm coming to get ya! __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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