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Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Nov 2020
Posts: 39
Just Getting Started
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OP
Just Getting Started
Joined: Nov 2020
Posts: 39 |
I have just fitted an oil pressure gauge to my 2015 car.
All seems to work well enough and the hot running pressure seems much as I would expect. However, after a good long run (50 odd miles) the hot idle pressure drops to early 20s psi. It returns to the less worrying pressure instantly when I touch the throttle.
Any ideas what the hot idle pressure parameters should be?
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Joined: Feb 2016
Posts: 8,697 Likes: 416
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,697 Likes: 416 |
Remove the pressure gauge and drive in ignorant bliss 
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: May 2010
Posts: 9,554 Likes: 134
Needs to Get Out More!
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Needs to Get Out More!
Joined: May 2010
Posts: 9,554 Likes: 134 |
Don’t get a Plus8 with Rover engine if pressure variation worries you!
Last edited by sospan; 01/04/21 08:27 AM.
Plus Four MY23 Furka Rouge
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Joined: Jun 2012
Posts: 2,242 Likes: 72
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2012
Posts: 2,242 Likes: 72 |
Hot oil (about 90c+) pressure is about 25 psi at idle. Pretty normal 👍.
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Joined: Apr 2019
Posts: 488
Learner Plates Off!
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Learner Plates Off!
Joined: Apr 2019
Posts: 488 |
Mine goes down to around 25psi at tick over but only recently fitted the gauge so not driven in hot weather.
Thing is how accurate are the gauges? I just treat mine as a guide to what's going on and wouldn't be worried at 20psi hot tick over.
What oil are you using?
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Joined: Sep 2019
Posts: 365 Likes: 37
Learner Plates Off!
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Learner Plates Off!
Joined: Sep 2019
Posts: 365 Likes: 37 |
Remove the pressure gauge and drive in ignorant bliss 
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Joined: Jun 2012
Posts: 2,242 Likes: 72
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2012
Posts: 2,242 Likes: 72 |
Remove the pressure gauge and drive in ignorant bliss Ignorance may be bliss but the engine is very expensive........ You can always drive until the "engine has melted" light comes on 😁.
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Joined: Jul 2014
Posts: 663 Likes: 14
Talk Morgan Regular
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Talk Morgan Regular
Joined: Jul 2014
Posts: 663 Likes: 14 |
If you car is a GDI then that's just fine. I also fitted an oil pressure guage (2014 GDI) and get 25psi at tickover when hot -- which is plenty. The great thing about the pressure guage is that it tells you when the oil is hot enough to rev the engine. Don't rev it over 2krpm when it's cold and the needle is stuck right up at the top end.
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Joined: Feb 2019
Posts: 3,857 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,857 Likes: 2 |
Hot oil (about 90c+) pressure is about 25 psi at idle. Pretty normal 👍.
+1, and oil weight, and oil brand, and oil type, and miles on engine, how the engine was broken in, and how warm is “warm”? Lots of variables but from what you are saying I would not worry.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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Joined: Dec 2017
Posts: 2,223 Likes: 183
Talk Morgan Expert
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Talk Morgan Expert
Joined: Dec 2017
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In ten years of production and over 2000 M3Ws produced how many melted engines have we experienced? I'm in the ignorance is bliss camp and I did blow an engine (not due to oil pressure)!!!!!!
Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice) tis no more
2013 M3W (Olga)
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