Low oil pressure on R32 gtst

[shazza]

Hi ppl,

looking for some technical advice on my RB20 for my R32gtst. I just recently had it serviced, oil filter change, oil change (20W-50), gasket replaced. After getting it back my oil pressure on my std gauge reads just above 4 when i start the car and after about 5 mins of driving and the engine warming up the guage would read just above 0 near idle and just under about 2 while cruising.

I took it back to my mechanic who checked said the oil should b ok weight (20W-50), no oil leaks (check engine bay and oil level), and the engine sounded fine so it must be a faulty guage. But, the guage appeared to work fine before the service.

I also notice now when i start hitting higher revs around the 5k to 6k range the car stutters a little and i am unsure if i hear a faint knocking sounds. From my little understanding of engines, i am assuming the engine is starved of oil when pushed harder.

I am just looking for a second opinion on what problems i might be having and how to diagnose it before destroying my block. Even recommendations on who could give a second opinion (hopefully someone who wont rip me off after spending all the cash on a service already).

Cheers

[zeroyon]

The factory oil gauge in 32 is notoriously for being in-accurate.

If your concerned about it get another oil pressure gauge that reads psi onto it.

If your not sure about doin that youself heaps of workshops will test it for you.

[Rossco]

After getting it back my oil pressure on my std gauge reads just above 4 when i start the car and after about 5 mins of driving and the engine warming up the guage would read just above 0 near idle and just under about 2 while cruising.Cheers

My gtr does the exact same thing. It will always read less during start / stop driving, as it relies on engine rpm. The more consistent rpm (i.e cruising), the more pressure.

[B0BB0]

the oil pressure reads higher on initial start up becuase the oil is thicker.

the oil pump is driven off the crank, so the higher the rpm the higher the oil pressure.

the only thing i would really worry about is, making sure the oil pressure rises on the gauge with rpm.

[TJ]

and that noise you hear at high revs could be detonation

[Skyline]

I know this is a stupid question but have you actually checked the oil level in the car after you got it serviced? It could be something as simple as that.

[shazza]

cheers butters, can u recommend any workshops who you could TRUST?

[shazza]

Thanks for the advice guys.

i guess the main worry is that BEFORE the service, the gauge was at about 6 or 7 when cold (when oil is thicker) and when engine is warmed up it sits around the 4 mark. but AFTER the service (without any changes to the guage or watever) the guage will b at 4 when cold and then near 0 when warmed up.

so i am basically worried if my mechanic could have made a mistake somewhere.

as i mention in my original post i have checked oil level is FULL.

[tj] - could be knocking in the engine but its funny that i only started to feel this after i the full service and noticing the low oil pressure.

[Rossco]

Oil that is too thick, even on cold start up, is not good. And reading that high on the gauge would suggest the oil was pretty thick & gluggy. What weight was your previous oil?

[ReaperSS]

I have the exact same problem with oil guage,like Butters says im sure its a common problem on R32's.Must get mine checked aswell.You can trust Hyperdrive,they are very good with all nissan import stuff :)

[R32-GTR]

Stick with a good oil like Castrol R or Mobil 1 as they both hold good oil pressure at high temperatures. And dont rely on the factory pressure gauge for a reading they are really innacurate. Easiest would be to install an afternarket oil pressure guage

[Drkside]

Take it to another workshop - ie hyperdrive and have them check it. It seems weird that your gauge becomes inaccurate straight after a service.

[shazza]

Thanks guys.

appreciate the assistance. I will see if i can get it to hyperdrive, my fren had a lot of work done there and he recommends them too. I am sure they will point me in the right directions

GUN-32 : not sure wat oil since its the first service after importing it in. dont you just hate that first service after importing? doh!

[DCIEVE]

Running mobil 1 my oil pressure dropped alot compared to previous oils which could be one reason.
The standard guage may seem accurate but putting on an aftermarket guage will no doubt surprise you. My stocker guage still moves and indicates a reasonable oil pressure but is 90% of the time ~40psi off the actual pressure.

[32GTR2NV]

hi how are you
i almost garentee its the oil presure sender on drivers side of the block below the inlet manifold
have had same prob on both me gtr and gtst replaced both and were fine there like 65 new from nissan

[shazza]

hi how are you
i almost garentee its the oil presure sender on drivers side of the block below the inlet manifold
have had same prob on both me gtr and gtst replaced both and were fine there like 65 new from nissan
32GTR2NV - so from your experience the same happened to you with low oil pressure reading?

which nissan shop did you get the sender from? ez to DIY?

[Scradly]

In my opinon that oil is too thick. You should be using a 5w 50 or there abouts.
But yeah the gauge will be dodgy. I repaced mine and fitted an a/m gauge and its all good.
I woodnt buy a new one from nissan. I would buy an a/m one. Sure it might cost more but will be more accurate and look betta too.
Cheers

[Lumpy]

There is no aftermarket gauge sender that is 100% interchangable with the Nissan unit on a Skyline. Firstly the Nissan unit combines both a switch for the warning lamp, Secondly it contains a sender for the guage. That's 2 totally independant sensors in the one unit. A lot of people replace the stock unit on the likes of a Z32, which is gauge only with a VDO unit, but it doesnt read the same. The Z32 only has a single output sensor.

If concerned over oil pressure then you would normally have it tested with a known good gauge, but knowing how fickle the Nissan sender is, I'd just replace it, as it is 99.9% going to be the problem.

In all reality, I dont know why the factory bothered putting gauges in the car as they are far from accurate and incorporate a large amount of hysterisis in the display. If they were truely accurate, the owners would be forever at the dealer asking why the temp gauge goes up at the lights...... Most nissan gauges dont move even when there is 25deg C change in coolant temp!!!! The oil pressure one is also similarly indicative only.

As for Oil, stick with a good product. Dont expect a synthetic oil to last forever if you belt **** out of it. Also consider using a grade that suits the application and the age of the engine. I'd also go out of my way to use a quality filter, which is why we only use genuine Nissan items.

For our servicing, we use Mobil 1 5W50, as it's a good general use oil, however we have Mobil1 Tri-Synthetic 0W40, 10W30 and 15W50 available (albeit at a higher price than the garden variety product) if the customer requires something different.

Some of the higher mileage engines may be better off running something like a Mobil Synth S, which is 10W40.

[Pegga]

I would be streight in to a good machenich to get them to go for a drive with u.If its starting to knoock at high rpm and the oil pressure is low it could meen that at some stage someone has givin it a good revin while at the machenich gettin the service and it has started to flog out a bearing in ur bottem end.That will be an explaination of why the oil pressure is low and the knock.My VL turbo started doing the same thing then that knock got louder and louder and now it has been sitten in the shed for a few months.