Oil Pressure Problem

[mkent]

Hey Guys,

New to the forums - hope someone can shed some light on this.

Got an R32 GTR into our showroom last Saturday and it ran beautifully. Getting it ready for a customer so I decided to change all of the fluids and oils in the car from front to back. Changed the oil with Quaker State 5W - 30 and put in a ProFlow oil filter last night. Drove the car home and all was well. Sat in the driveway overnight and when I took it out this morning, it ran for about 10 minutes, then seemed to lose oil pressure.

The gauge started dipping below 2, then to 0 and the light came on. Sporadically, it crept up to 2 again briefly, then sharply dropped before staying at 0. I stopped the car and started up again - the needle just rested at 0.

Could this be the Oil Pressure Sending Unit getting full? Is this a problem that's happened to anyone else?

I haven't hooked up an external oil pressure gauge, but that is my next step. There is no knocking from the motor, and it sounds as though oil is indeed circulating... but the last thing I want to do is spin a bearing.

Any help would be greatly appreciated!!!

Thanks!Michael Kent416-738-3372

[Shocker]

I'd check it with an after market oil pressure gauge, check the oil level make sure its good. Thats really light oil as well. I'd stick with 10w-30 and up.

What happens when you give her a rev? Pressure jump up?

Mileage on the car? hopefully the crank collar isn't close to taking a total sh*t on you.... I pulled mine with only 65-70k and already a decent amount of wear on the snout.

[mkent]

Interesting...

Car has 104K on it, but that is Kilometers, which is 65K miles.

Indeed it is light oil - it was only supposed to be temporary to clean out any gunk in the motor, then we'd be putting in something much heavier.

Based on your experience, could the problem have been from the oil change? How are the oil pressure sensors on the GTR? Do they fill easily with a thin oil?

I didn't rev it past 2K after the light came on. Excuse the newbie question but without load, will the oil pressure gauge move a ton from free revving? Or should I take it out for a boot?

Agreed that first step would be an aftermarket oil pressure gauge. Do you know of any other tests that I can preform in the in

Thanks so much for all of your help. Any other tips would be more than welcomed.

[Gold Digger]

You might get a little more help in the RB forum. Go here zeroforum/135 and I'm sure you can get a little more help.

[Shocker]

I've never ran that thin of oil, when I was BPU, I was just running 10w30. Oil pressure was around 30 at idle once the car warmed up, and at WOT raised to about 60.

I'm now breaking in my 2.7 liter, and running 15w40 Diesel Oil for the first 1500 to break in the new rings. That sh*t is thick, at idle when cold pressure is sitting around 70, as it warms up it drops down to around 40-45 psi. I also installed an oil cooler and that seems to have raised the pressure in my system as well, along with thew new n1 oil pump.

If I free rev the pressure does jump up to around 60-65 psi, thats only at around 4 grand. Unlike a turbo that needs load to spool your oil pump is directly connected to your crank, so when you rev, it revs faster as well thus increasing the oil pressure.

Get an aftermarket gauge hooked up to it. Your old sensor could be faulty. Then test the pressure out.

[mkent]

Thanks everyone for your help.

Found the problem.

We were using a Nissan oil filter that blew out - something I've never seen before. The gasket on the filter came completely out of it's galley on the filter side. Oil was shooting out of the side of the filter and getting everywhere.

Thank god it's not a pump issue! We took it back to the shop and put a ton of other filters on the car as a test to see which filters tended to blow out under boost and which did not. I'll tally up the results and post them on the site.

Thanks again for all of your input!

[Gold Digger]

Good to know everything is ok. When you find a good filter, please be sure to get those listed here on the site. I am sure all GT-R owners would be interested to know which filters they can cross reference there in North America.

[letsrace98]

run some miracle oil for five min threw the motor and then change the oil and oil filter again a mechanic told me to do that to my car and it worked just fine after you might some engine sludge and this will take car of it