Advertise on fullfatrr.com »

Home > Maintenance & Mods (L405) > Low SAPS 5W40 synth engine oil
Post Reply  Down to end
Page 6 of 7 <1234567>
Print this entire topic · 
Gremlin500



Member Since: 11 Mar 2022
Location: Newcastle, UK
Posts: 1851

United Kingdom 2017 Range Rover Vogue TDV6 Corris Grey

I emailed Smith & Allen about it last year, they didn’t even bother to reply!

I can now see their point of view, after all the interest even on this informed forum hasn’t been exactly spectacular, so the general population of owners out there would probably be too scared or reluctant, and a bulk purchase could take a very long time to sell. Confused V6 Vogue - “Less is More” - less to go wrong!

Post #710119 25th Jan 2025 10:29am
View user's profile Send private message View poster's gallery Reply with quote
kevinp



Member Since: 28 Sep 2019
Location: Telford
Posts: 1357

United Kingdom 2011 Range Rover Autobiography TDV8 Santorini Black

Gremlin, I for one would deffo use the 40 grade oil if one could be made.
From all I've heard a 30 grade can quickly deterioate to 20 which is concerning.
You made a very valid topic by starting this post.
Thumbs Up

Post #710126 25th Jan 2025 11:50am
View user's profile Send private message View poster's gallery Reply with quote
bozmandb9



Member Since: 06 Dec 2010
Location: Wallingford, Oxfordshire
Posts: 1055

2013 Range Rover Vogue SE TDV8 Causeway Grey

Gremlin500 wrote:
@D3Jon:

No, the point of my thread was that I’d found the “Holy Grail”, -a 5W40 C4 that would directly replace the watery C1, yet not f*ck up my DPF, knowing that a C1 5W40 simply doesn’t exist.
The other point of the thread was to gauge interest, before I decide how much of it to buy, assuming the price isn’t silly.

It does seem this whole subject is poorly understood in general, and also that folks are scared to try anything that hasn’t passed through JLR’s approvals process.

What will those people do when C1 becomes unobtanium in a few years? Whistle


Hi Gremlin, sorry I know it's an old thread, but is there a C4 5W40 which we can currently buy off the shelf, since I'm going off my noggin trying to find one? Otherwise, is it best to buy 'Low Saps C3?

I'll post some photos of my calipers, as I finally got around to taking them! 2012 SDV8 Vogue SE

Post #716411 19th Apr 2025 6:56pm
View user's profile Send private message View poster's gallery Reply with quote
Gremlin500



Member Since: 11 Mar 2022
Location: Newcastle, UK
Posts: 1851

United Kingdom 2017 Range Rover Vogue TDV6 Corris Grey

The short answer is no, at least not in small quantities, only in bulk (like 5 figure sum bulk). I was prepared to go for it, but got a lukewarm reception on here, so didn’t.
My advice would be, keep using the 5W30 C1 ULS, and change the oil & filter every 5K miles, (well before dilution gets significant). If you have a V6, replace the oil pump when you replace the belts.
Maybe things will change as more AdBlue cars fall out of Warranty, so the 5W40 C4 will become a thing. V6 Vogue - “Less is More” - less to go wrong!

Post #716416 19th Apr 2025 8:13pm
View user's profile Send private message View poster's gallery Reply with quote
Mohawk



Member Since: 07 Oct 2025
Location: Bristol
Posts: 9

United Kingdom 

So as an SDV6 3.0D engine owner I've seen the LR time videos & been looking at oil grades etc & found this thread.

Having read up on the differences between the various C grades Diesel oils & known forever the differences in multi grades, one thing struck me re the various for & against arguments in this thread.

Namely that most people whilst very elegantly stating their case for C1 or C3/4 regardless of weight, are completely missing the point !

The point being that 5w-30 Cx is & will always be thinner than 5w-40 Cx, but 5w-40 will always provide better protection to a hot engine & a higher (not by much) oil pressure at a times. With possibly a very
Minor increase in internal engine drag leading to insignificant mpg reduction. You may have a lead foot or not which will cause a far higher mpg difference!

So that leaves C1 or C3 to be considered?
Now before diving down the SAPS & DPF impact, let's consider WHAT we are discussing here? Engine Oil right !?

I don't know about you but I prefer to keep mine in my engine. And my engine which is in good working order, gives up the same amount each year at service when the oil is changed! People here & elsewhere talk about oil dilution by diesel (a light oil) due to over fuelling, DPF regen fuelling etc. So given the fact that the pressure in the cylinders is generally always higher than that in the crankcase & that during combustion unburnt fuel can get into to crankcase, then oil migration into the combustion chamber is negligible.

How much oil do you think your engine burns in a year ?
Answer = Tiny amounts, most of which remains in the cylinder as carbon deposits!
Now look at some videos of super-tuned diesel vehicles & see that black (soot) smoke that erupts from their exhausts & remember those 500K+ mile Peugeot 504's from the 1970's. That is what the DPF is filtering & burning up. 99.9999% of that is diesel soot, not burned oil.

So IMHO C1 or C3 makes no real world difference if your engine is not burning oil for a past time !

Based on that personal assessment I'll be using 5w-40 C3 from now on.

As always you pays ya money & takes ya pick & YMMV.

Post #725762 7th Oct 2025 2:15pm
View user's profile Send private message View poster's gallery Reply with quote
Shaun_



Member Since: 02 Feb 2017
Location: New Forest
Posts: 91

United Kingdom 2012 Range Rover Westminster 4.4 V8 Santorini Black

So you joined the forum today, don't own a Range Rover and that's your opening post is it?! Wow! 2012 TDV8 Westminster in the New Forest

Also: Land Rover Series 3 SWB, Mercedes 280SL, Classic Mini race replica, VW Golf SV
Previously: Audi A8, RR TDV8 Vogue, Audi Allroad, VW Golf GTI Edition 30, Audi A4 Avant, A8, A4 Sport, A6, VW Golf Mk5, Bora, Golf GTI Mk3, Jetta Mk3, Passat, Jetta Mk1, Golf Mk1

Post #725769 7th Oct 2025 3:44pm
View user's profile Send private message View poster's gallery Reply with quote
Shaun_



Member Since: 02 Feb 2017
Location: New Forest
Posts: 91

United Kingdom 2012 Range Rover Westminster 4.4 V8 Santorini Black

So you joined the forum today, don't own a Range Rover and that's your opening post is it?! Wow! 2012 TDV8 Westminster in the New Forest

Also: Land Rover Series 3 SWB, Mercedes 280SL, Classic Mini race replica, VW Golf SV
Previously: Audi A8, RR TDV8 Vogue, Audi Allroad, VW Golf GTI Edition 30, Audi A4 Avant, A8, A4 Sport, A6, VW Golf Mk5, Bora, Golf GTI Mk3, Jetta Mk3, Passat, Jetta Mk1, Golf Mk1

Post #725770 7th Oct 2025 3:44pm
View user's profile Send private message View poster's gallery Reply with quote
Mohawk



Member Since: 07 Oct 2025
Location: Bristol
Posts: 9

United Kingdom 

Yep, but I do own a Jag F-Pace with the V6 3.0D which is used in the RR & LR too so the issues are the same unfortunately ☹️

Post #725772 7th Oct 2025 4:16pm
View user's profile Send private message View poster's gallery Reply with quote
Mohawk



Member Since: 07 Oct 2025
Location: Bristol
Posts: 9

United Kingdom 

Apologies if I offended the natives, it was not intentional.

Post #725773 7th Oct 2025 4:21pm
View user's profile Send private message View poster's gallery Reply with quote
Gremlin500



Member Since: 11 Mar 2022
Location: Newcastle, UK
Posts: 1851

United Kingdom 2017 Range Rover Vogue TDV6 Corris Grey

We get a few KIA owners on here occasionally…

Someone needs to tell the oil companies they have wasted their precious time and money developing ULS oils Whistle V6 Vogue - “Less is More” - less to go wrong!

Post #725775 7th Oct 2025 4:33pm
View user's profile Send private message View poster's gallery Reply with quote
fisha



Member Since: 25 Sep 2009
Location: Scotland
Posts: 1552

2015 Range Rover Autobiography SDV8 Aruba

Mohawk, all engines will burn some oil , granted it’s not meant to be loads, but they will burn it. Oil sweeps the cylinder walls and a film always remains after the piston down stroke, which will get burnt in the cylinder. Plus you just have to look at a typical intake of a diesel to see how oily the intake is from egr/, turbo seals etc etc. that still gets drawn into the cylinder as well.

Considering that a dpf fills with about 20g - 30g of soot before a regen occurs, that’s not really a lot of soot. But it not the soot that’s the problem, as that burns off … the ash doesn’t. The ash comes from the additives in the oil … which do get burnt in the cylinder and go down the exhaust. That ash sticks to the dpf , but doesn’t clear on a regen. Even if the ash generated was a fraction of a gram in a typical regen period, that build up could quickly become something that reduces the effectiveness of the dpf over time.

So if I had the choice between an oil that had far less ash content and one that didn’t, I know which I would rather have for my dpf. V8 or else ...

Post #725776 7th Oct 2025 4:39pm
View user's profile Send private message View poster's gallery Reply with quote
Mohawk



Member Since: 07 Oct 2025
Location: Bristol
Posts: 9

United Kingdom 

Fisha, I fully understand that and appreciate the explanation.

This thread was quite informative. But as ACEA has canned the C1 standard, note NOT replaced or superseded, just dropped it, that says to me how bad that was as an idea. Many other cars are built & run DPF's on C3. JLR were regulated into reducing whole fleet emissions & due to having no small vehicles in their line up, they had to adopt these very dubious standards to achieve maximum mpg in every vehicle including the disgraceful extended oil change intervals. Plus there is ZERO need for fuel dilution if they had added an afterburner injector in the exhaust before the DPF to heat it, rather than adding excess fuel to the combustion chamber. Regardless they screwed up massively & I guess that may have been part of the decision to switch Jaguar to Electric in future, no Euro Emissions standards to adhere to & allows the RR+LR brands to continue on the ICE route for a few more years, due to the reduced fleet emissions.

As I stated I have made my own assessment & will proceed on that basis. Others are free to do as they please.

Post #725802 7th Oct 2025 9:57pm
View user's profile Send private message View poster's gallery Reply with quote
Mikey



Member Since: 10 Jan 2008
Location: Dundee
Posts: 1874

Scotland 

Mohawk wrote:


The point being that 5w-30 Cx is & will always be thinner than 5w-40 Cx, but 5w-40


So why not use a 10w40, or a 15w40?

Post #725810 8th Oct 2025 7:41am
View user's profile Send private message View poster's gallery Reply with quote
JayGee



Member Since: 27 Jul 2021
Location: London
Posts: 3380

United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

If I was running a V6 I’d be more concerned about the quality of the base stock used in the oil rather than anything else as it’s this that determines the film strength and how well metal on metal contact is avoided. Higher viscosity does not necessarily mean better film strength and larger viscosity ranges are achieved by viscosity modifiers which degrade due to oil shear in use so a 40 will drop to a 30 faster than a 30 to a 20 ( not seen evidence of the latter BTW) 2012 TDV8 Vogue (L322)

Post #725813 8th Oct 2025 9:03am
View user's profile Send private message View poster's gallery Reply with quote
JayGee



Member Since: 27 Jul 2021
Location: London
Posts: 3380

United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

Mikey wrote:
Mohawk wrote:


The point being that 5w-30 Cx is & will always be thinner than 5w-40 Cx, but 5w-40


So why not use a 10w40, or a 15w40?

It's way too thick to circulate in the engine on a cold start esp in temperate climates. 2012 TDV8 Vogue (L322)

Post #725814 8th Oct 2025 9:21am
View user's profile Send private message View poster's gallery Reply with quote
Post Reply  Back to top
Page 6 of 7 <1234567>
All times are GMT + 1 Hour

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2025 Futuranet Ltd & Martin Lewis
fullfatrr.com RSS Feed - All Forums


Switch to Mobile site