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5W30 or 5W40 oil for the sdv?
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Wsh
 


Member Since: 16 Feb 2014
Location: Bennebroek
Posts: 17

Netherlands 2006 Discovery 3 TDV6 HSE Auto Lugano TealDiscovery 3
5W30 or 5W40 oil for the sdv?

Hi

As we have to rebuild our engine anyway I am now considering running it on 5W40 oil rather then 5W30 after seeing this youtube clip.

I am wundering if there are good experiences or opinions on this subject

  
Post #232634812th Feb 2023 10:11 am
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20700

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

JLR state a 5W30 to STJLR.03.5005/FORD WSS-M2C934-B

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Post #232635212th Feb 2023 10:53 am
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Flatlander
 


Member Since: 20 Jul 2015
Location: Here
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United Kingdom 

...
  
Post #232636612th Feb 2023 12:15 pm
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Mastertech
 


Member Since: 13 Apr 2014
Location: North East
Posts: 126

England 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

And people wonder why these engines eat bearings running what is essentially a 5w20 oil with a HTHS of 2.9 in a high torque diesel.

I run VAG 502 5w40 oil in mine has a HTHS of 3.6 and is diesel rated. I cannot fathom how common engine bearing issues are and yet people still insist on sticking with a oil spec that does not provide adequate protection.
  
Post #23320202nd Apr 2023 8:52 am
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20700

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

HTHS is measured at 150 degrees C

You'll likely never see oil temps above 105 degrees

What is a bigger issue, is the quantity of oil in the engine Thumbs Up
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Post #23320262nd Apr 2023 9:51 am
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Mastertech
 


Member Since: 13 Apr 2014
Location: North East
Posts: 126

England 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

Oil temp around different parts of the engine can vary massively and sump oil temp only gives a indication of what’s going on. Also usage will vary oil temp ie towing 3.5 ton up a long incline is going to get the engine oil nice and hot.

Just because the test temp may be 150 degrees doesn’t mean the value isn’t relevant. Ford obviously thinks a thicker oil is required with a decent additive pack as they spec the same oil for the 3.0 in arduous usage as they spec for the 6.7 powerstroke.

Land Rover is more concerned about emissions than anything else. Look at the Ingenium it had numerous issues when released which are related to the oils inability to hold fuel and still protect the engine. Is a HTHS of 3.5 was specified then this would not have been a issue.

Take VAG, one of the biggest motor manufacturers in the world. They do not spec low HTHS oils for high output diesels. The two they do spec them for are in a detuned state from normal.

Keep drinking the LR oil is good oil fizzy pop all you want but people who want the best for their engines should use a VAG 504/507 spec oil as a minimum this has a HTHS of 3.5 is fully DPF compatible and has a add pack that’s hard to beat in a off the shelf oil spec. You simply cannot argue that it’s not a better oil.
  
Post #23320722nd Apr 2023 5:18 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20700

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

The Ingenium issues are nothing to do with oil specified Laughing

Engine oil temperature will never reach 150 degrees inside an engine. If it did, it wouldn't last long whether it was running 5W30 or 5W40
The highest I've ever seen my oil temp was 106 degrees, towing an RRS up the M6 towards Shap

Other than a higher HTHS rating (which is largely irrelevant for the above reason) I've still seen no evidence or proof that 5W40 is a superior oil to 5W30...
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Post #23320782nd Apr 2023 5:51 pm
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Mastertech
 


Member Since: 13 Apr 2014
Location: North East
Posts: 126

England 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

I never said it would reach 150 degrees, just that you cannot rely on sump temp as a max temp your oils at, at that time.

The Ingenium issues are to do with oil specified. Maybe not all but most. They had to make changes so the evoque didn’t continue to kill engines running thin oil diluted by fuel. Same with the disco sport. Failing to recognise that which is something LR isn’t going to put in any technical bulletin is failing to recognise what’s causing the parts failures.

You need to understand that the way a oil is labelled “5w30” or “0w40” is actually a very poor way to categorise oil. A 0w20 can be just as “thick” as a “5w30” and making a statement like HTHS is irrelevant is irrational. I suppose you think CST is irrelevant too.
  
Post #23320832nd Apr 2023 6:26 pm
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Mastertech
 


Member Since: 13 Apr 2014
Location: North East
Posts: 126

England 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

You say you don’t see the need for a 5w40 over the 5w30. That’s fine I don’t actually disagree with that. What I do believe is the Ford/ JLR spec is poor for the usage scenario.




As you can see from the Ford specs compared (all the ones they have listed) against the VAG spec 504/507 the VAG spec is better in all cases other than fuel economy.

Personally I couldn’t care about 1mpg if it’s protecting my engine better.
  
Post #23320862nd Apr 2023 6:34 pm
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superantew
 


Member Since: 18 Mar 2023
Location: Sweden
Posts: 22

Sweden 2012 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4

I'm planning on running the motul x-clean 5w40gen 2 Wich has way higher hths rating but still made very clean to be able to pass the dog filter..

Motul has another 5w40oil think this vag511 or something and has even higher hths and are made for high power vehicles.. Although this has thicker soot particles Wich might clog your dog.

That's my 2 cents.. I'm not running the 5w30..
  
Post #23324065th Apr 2023 5:07 pm
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Mastertech
 


Member Since: 13 Apr 2014
Location: North East
Posts: 126

England 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

A VAG 511 oil will be fine in a DPF equipped vehicle as it was designed to be used with particulate filters. The Audi RSQ8 in which this oil was first used is equipped with a petrol particulate filter.
  
Post #23325076th Apr 2023 7:29 am
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Weyboat
 


Member Since: 13 Apr 2018
Location: Weymouth
Posts: 261

England 2015 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

Disco_Mikey wrote:
JLR state a 5W30 to STJLR.03.5005/FORD WSS-M2C934-B

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They also state 15000 miles between oil changes!
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Post #23326086th Apr 2023 8:21 pm
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jmich
 


Member Since: 23 Dec 2010
Location: Mons
Posts: 21

Belgium 2011 Discovery 4 3.0 TDV6 HSE Auto Nara BronzeDiscovery 4

One problem I've read about is that our engines can be sensitive to diesel diffusion in the oil, which leads to dilution and reduces oil viscosity when hot...
So with a 5W40 oil you have a bit more margin than with a 5W30... ?

But the easiest thing to do is to change the oil more often...
 JM  
Post #23525558th Nov 2023 9:42 am
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NC500
 


Member Since: 18 Sep 2017
Location: On the NC500
Posts: 492

Scotland 2014 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4

My first time wading into this issue! I won’t make a comment on the 5w30 or 40 argument as I am just a bloke driving a D4 and posses no qualifications to venture an opinion.

However, I can put my tuppence worth in regarding fuel dilution. I send a sample of every used batch of oil off for analysis and in my experience of 25 (ish) samples I can inform you all categorically that my D4 which has mixed use driving conditions (hours long drives at 60 ish plus many short journeys on A, B and off-road) that oil change intervals of 6000 miles will keep fuel dilution below 1.5%.

15,000 intervals will see dilution upwards of 5% (very dangerous) and soot levels of over 4% (a nice abrasive paste by that stage).

Therefore, whatever viscosity you use, keep oil changes more frequent - you decide what that is for yourself
 

Last edited by NC500 on 8th Nov 2023 10:18 am. Edited 1 time in total 
Post #23525568th Nov 2023 10:01 am
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NC500
 


Member Since: 18 Sep 2017
Location: On the NC500
Posts: 492

Scotland 2014 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4

Oil analysis labs put maximum fuel dilution levels at around 3.5% with 4% being identified as a critical level.

https://www.savantlab.com/testing-highligh...detection/

Oil manufacturers and test labs indicate that dilution in excess of 4% could possibly lead to “lack of lubrication” (as the oil viscosity is reduced) leading to bearing failures, premature engine wear etc.

JLR state that 6% is an acceptable level of fuel dilution - don’t know why their engine can tolerate such high levels….🤔🫤

If you are already running a low viscosity (ie 5w30) then for goodness sake, keep your fuel dilution levels low!
  
Post #23525588th Nov 2023 10:08 am
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