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Old 6th November 2019, 12:52 PM   #1 (permalink)
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R35 Engine oil pressure from cold

Hello

Sorry if this has been asked before but searching on here I can't find it.

I have only had my 2014 GTR a week and this morning I noticed starting from cold the engine oil pressure was showing up at 100psi. The car seems to run fine and after about 15 mins it started to settle down (around 40). Is this normal for a GTR? It had all fluids changed last week so has only done around 300 miles with the current oil.

Thanks

Jim
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Old 6th November 2019, 08:44 PM   #2 (permalink)
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You don't say what RPM you see 100psi.

The more quantifiable number might be what the idle pressure is once the engine is hot.

Mine is around 30psi at 900 RPM with 10-50 Synthetic oil.

If you are using a xx - 60 Synthetic oil, it will show more.
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Old 7th November 2019, 09:51 AM   #3 (permalink)
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Hi Hugh

Thanks for the reply. I started it up again this morning (cold car, cold day). It idled at 2000rpm for a short while and the pressure was at 110. It settled down to around 1500 pretty quickly and the pressure dropped to 100. The pressure continued to drop until the car came up to temp when the pressure settled (on idle (just below 1000)) to around 30 psi.

Do you think this is anything to be concerned about? Or does this sound normal?
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Old 8th November 2019, 09:20 PM   #4 (permalink)
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When the oil is cold it has a much thicker viscosity - meaning greater pressure as it doesn't flow so easily. One of the main reasons why it's bad to thrash the car before it's all fully warmed through.

I don't think your readings are a problem, on the basis that it settles back down to 30 once warm (indicating gauge is good)
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Old 8th November 2019, 09:48 PM   #5 (permalink)
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Thanks GTR Mart. Much appreciated. Very new to GTR ownership and definitely not doing any spirited driving until it’s fully warmed up!
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Old 12th November 2019, 12:10 PM   #6 (permalink)
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Quote:
Originally Posted by Topjacket View Post
Hi Hugh

Thanks for the reply. I started it up again this morning (cold car, cold day). It idled at 2000rpm for a short while and the pressure was at 110. It settled down to around 1500 pretty quickly and the pressure dropped to 100. The pressure continued to drop until the car came up to temp when the pressure settled (on idle (just below 1000)) to around 30 psi.

Do you think this is anything to be concerned about? Or does this sound normal?
Agree with Martin,

Nothing to worry about on the normal operating temps.

I will have a look at my oil pressure when cold, but my engine does not idle as high as yours, it drops to just over 1000 after a couple of seconds, so may not register in the same way as yours.

I do my best not to piss my neighbors off, so have worked to get the revs down as quickly as possible
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