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Oil pressure low at idle


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Changed the oil yesterday. Went for a short spin. Got caught in a construction zone for 30 minutes. 75 degrees outside.

The water temp was reading 90. When I was stopped and idling, the oil pressure was dropping almost to the redzone, but immediately came back up to normal (centre of guage) when I started moving, even at slow speeds.

Normal?

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A 10w 60 may improve it very slightly, but I wouldn't think it would be noticeable, if it's only when it's really hot and not getting any cooling from air flow over the oil coolers then you have two choices, live with it or over-ride the fans to make them cut in sooner.

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Yep,.

The fact it raises with engine speed indicates it's not the pressure relief stuck open, nor is the resistance to oil flow is really low (engine really worn). Not sure if having the air con on would help improve air movement over the coolers, if it does that may help slightly, but TBH oil pressure is not the main thing, it's just an indication that oil is being moved around and being forced between components to stop metal to metal. Low pressure with a good oil can be a lot better than high pressure with a poor oil.

Andy

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According to the Lotus manual the oil pressure ccan go into the red and still be within the tolerances laid out. With the S4 oil gauge it pretty much has to be at absolute zero of just above to be a problem. Mine sits half way into the red and is within tolerance set out by Lotus.

Simon  (94 S4)      My Esprit will be for sale in late 2017

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Second those comments and yes perfectly normal.

My Esprit worried me when I first got it but every other S4 / S4s I've been in does the same. On idle when warm guage falls to first mark just above the red but sits just over halfway when driving 4000revs+ and just under half at about 3-4000revs.

Normal...btw I'm using Castorl RS Sport 15-60 from OpieOils

Waynef

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My local specialist Paul Matty recommends 25/50 semi synthetic (Miller Motorsport). I have been using this for the last couple of years and it's great. Upshot is, as its thicker the engine uses less and it's half the price of Mobil 1, 10ltrs for

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Adrian, that's the wrong weight of oil for your car, it won't be doing it any good.

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

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In a hot engine 20w 50 will be thinner than 10w 60, the first set of numbers are the winter ones, they relate to the single viscosity oil that the multi-grade behaves like when cold. the second set refer to the way the oil behaves when hot.

So, take a SAE 10 oil cold, and 10w60 cold, and both are the same viscosity, heat them both up, the SAE 10 becomes like water while the 10w 60 thins, but no where near as much.

Take SAE 60 oil and 10w 60 oil at working temperature, both have the same viscosity, but let them both cool down, the 60 goes like honey, while the multi-grade gets thicker, but no where near as thick.

From memory the Lotus spec allows for 20w50, but it's not ideal, 15w 50 is better. As Bibs is noting 25w50 will be the same as 20w 50 when hot (so fine) but when the engine is cold it's a long way from the desired viscosity.

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I have seen a NOTICEABLE difference between Valvoline 20/50 Racing oil and the Mobil One 15/50. My gauge is almost nothing at idle with the synthetic. It is the synthetic oil's low viscosity properties that cause that low reading on the gauge. Put in regular dino oil and you will see the pressure improve.

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