Oil pressure problem. - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

Tassu_Spirit · 30th August 2006, 07:40 PM

I changed my bnr32's oils into Motul 300V 20w-60 and oil pressures raised quite a bit. Now when cold start the engine oil pressure is around 7bars. It also pushes 7bars when driving at full throttle. I think this is too much and it also shows when oil filter can't take this amount of pressure. I have nissans original oil filter and it works well when drivin nice or little bit faster but when driving hard there is a nice oil spray.
Idle pressure is about 2.2bar and normal drivin ~3.8bar.
I have new bearings inside the motor (if someone is interested)
Is this 20w-60 oil way too thick or what is happening in my motor?

edmy · 30th August 2006, 08:12 PM

im no expert but i wud say oil is abit on the thick side
also have u changed oil pressure sensor? just changed mine see thread in general

NikWilson · 30th August 2006, 08:18 PM

I use Castrol RS oil which is 0W40 in my GTR, so I suspect your oil is way too thick

Nik

leggus · 30th August 2006, 08:20 PM

Quote:

Originally Posted by NikWilson

I use Castrol RS oil which is 0W40 in my GTR, so I suspect your oil is way too thick

Nik

I was advised that 0W40 would burn off to quick, by mechanic at local garage, so then asked Oilman from here, he agreed, keep your eye on the dipstick.

NikWilson · 30th August 2006, 09:07 PM

Quote:

Originally Posted by leggus

I was advised that 0W40 would burn off to quick, by mechanic at local garage, so then asked Oilman from here, he agreed, keep your eye on the dipstick.

Thanks for that. But 2 light track days and no oil loss at all. I do keep an eye on the oil level very carefully - just in case!

0W40 is very light, I did use last year Mobil 5W40 but have found the Castol RS oil to be fine. I think Castol RS oil has now been discontinued and has been replaced.

Nik

Tassu_Spirit · 31st August 2006, 12:36 PM

I just changed my oils to Motul 8100 5w-40 and oil pressures dropped into something around 4bars when floored. But now it looks like it drops into 2 bars at high rpm.
Is this normal?

Haven't driven much after oil shop visit 'cos realised that nissan was pretty slippery on wet, but maybe tomorrow I'll take it to test drive to see what is happening with the oil pressures.

Gez · 3rd September 2006, 11:52 AM

2bar at high revs is way too low. You should have around 4bar

edmy · 3rd September 2006, 08:54 PM

i changed my oil then my oil pressure dropped dramatically shit my pants thought is was fecked changed my oil pressure sender all ok!!!
the senders are always going faulty

R33_GTS-t · 3rd September 2006, 10:06 PM

Silkolene 5w-40 is decent.

Don't forget that the pressure will be slightly elevated during the first few minutes of driving.

bob sprocket · 5th September 2006, 07:15 PM

running 5w40 i used to get low pressure especially when hot.
changed to silkolene 10w50 and pressures spot on all the time.
it never helped my warped brake discs though.

Luckham · 5th September 2006, 10:15 PM

Quote:

Originally Posted by Tassu_Spirit

Is this 20w-60 oil way too thick or what is happening in my motor?

Oil that thick will actually reduce BHP.. [Especially in cold weather]

You want to be using 15W-50 Motol/Silkolene/Mobil 1 IMO.

Anything below 10W-40 is too thin.. Our engines don't have the tolerances for the really thin stuff.. So again it doesn't do them any favours.

Standard gauges [& senders] can be really inaccurate [mine was], fit an aftermarket mechanical one if you want to know the real pressure..

7bar isn't anything to worry about but I would get rid of the 20w-60.

EvolutionVI · 6th September 2006, 09:37 AM

Quote:

Originally Posted by Tassu_Spirit

I just changed my oils to Motul 8100 5w-40 and oil pressures dropped into something around 4bars when floored. But now it looks like it drops into 2 bars at high rpm.
Is this normal?

It is normal
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.
.
.
.
.
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when the engine is at its end

Maybe you have a problem with the gauge,hopefully for you,but i think you have a problem with the oilpump,dont drive the car till you checked everything,you should minimum see 4 bar at higher revs,i have around 6 bar at high revs with the uprated pump.

It´s not normal to see 7 bar with 20w60 and only 2 bar with 5w40,check that befor you drive the car again.

Tassu_Spirit · 8th September 2006, 06:56 PM

Quote:

Originally Posted by EvolutionVI

It is normal
.
.
.
.
.
.
.
.
.
.
when the engine is at its end

Maybe you have a problem with the gauge,hopefully for you,but i think you have a problem with the oilpump,dont drive the car till you checked everything,you should minimum see 4 bar at higher revs,i have around 6 bar at high revs with the uprated pump.

It´s not normal to see 7 bar with 20w60 and only 2 bar with 5w40,check that befor you drive the car again.

Thanks man. I'll take mine to doctor next time I start it. And have to start looking aftermarket gauges and oil pump.

30th August 2006, 07:40 PM	#1 (permalink)
Tassu_Spirit GTR Register Member Join Date: Jul 2006 Location: Finland Posts: 22	Oil pressure problem. I changed my bnr32's oils into Motul 300V 20w-60 and oil pressures raised quite a bit. Now when cold start the engine oil pressure is around 7bars. It also pushes 7bars when driving at full throttle. I think this is too much and it also shows when oil filter can't take this amount of pressure. I have nissans original oil filter and it works well when drivin nice or little bit faster but when driving hard there is a nice oil spray. Idle pressure is about 2.2bar and normal drivin ~3.8bar. I have new bearings inside the motor (if someone is interested) Is this 20w-60 oil way too thick or what is happening in my motor?

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30th August 2006, 08:12 PM	#2 (permalink)
edmy GTR Register Member Join Date: Apr 2005 Posts: 526	im no expert but i wud say oil is abit on the thick side also have u changed oil pressure sensor? just changed mine see thread in general

30th August 2006, 08:18 PM	#3 (permalink)
NikWilson GTR Register Member Join Date: Oct 2002 Location: East Dereham, Norfolk. UK Posts: 933	I use Castrol RS oil which is 0W40 in my GTR, so I suspect your oil is way too thick Nik

31st August 2006, 12:36 PM	#6 (permalink)
Tassu_Spirit GTR Register Member Join Date: Jul 2006 Location: Finland Posts: 22	I just changed my oils to Motul 8100 5w-40 and oil pressures dropped into something around 4bars when floored. But now it looks like it drops into 2 bars at high rpm. Is this normal? Haven't driven much after oil shop visit 'cos realised that nissan was pretty slippery on wet, but maybe tomorrow I'll take it to test drive to see what is happening with the oil pressures.

3rd September 2006, 11:52 AM	#7 (permalink)
Gez GTR Register Member Join Date: Jan 2003 Location: London/Sydney Posts: 2,416	2bar at high revs is way too low. You should have around 4bar

3rd September 2006, 08:54 PM	#8 (permalink)
edmy GTR Register Member Join Date: Apr 2005 Posts: 526	i changed my oil then my oil pressure dropped dramatically shit my pants thought is was fecked changed my oil pressure sender all ok!!! the senders are always going faulty

3rd September 2006, 10:06 PM	#9 (permalink)
R33_GTS-t GTR Register Member Join Date: Apr 2005 Location: [510] days from disposing of Labour. BNFL are shit. One repossession, one (bank) window. Posts: 8,241	Silkolene 5w-40 is decent. Don't forget that the pressure will be slightly elevated during the first few minutes of driving.

5th September 2006, 07:15 PM	#10 (permalink)
bob sprocket GTR Register Member Join Date: Jul 2006 Location: down stairs in the sitting room Posts: 11	running 5w40 i used to get low pressure especially when hot. changed to silkolene 10w50 and pressures spot on all the time. it never helped my warped brake discs though.