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l322novice



Member Since: 15 Jan 2016
Location: South
Posts: 32

United Kingdom 2004 Range Rover Vogue 4.4 V8 Buckingham Blue
TDV6/SDV6 vs D300

Hi all and apologies if this has already been discussed and answered. Been without a Range Rover for too long now and pondering what to splash out on if the horses come in. What is the consensus, a nice late-ish low mileage L405 V6 diesel (either TD or SD) or an early Ingenuim L405 D300?
Of course the web is full of horror stories regarding crankshafts and or timing chains respectively.
Just wondering. šŸ˜

Post #710166 25th Jan 2025 3:55pm
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Philip



Member Since: 05 Jan 2010
Location: UK
Posts: 2587

2019 Range Rover Autobiography SDV8 Aintree Green

Definitely D300/350.

Post #710183 25th Jan 2025 6:09pm
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l322novice



Member Since: 15 Jan 2016
Location: South
Posts: 32

United Kingdom 2004 Range Rover Vogue 4.4 V8 Buckingham Blue

Thanks Phillip. Are they that much better?

Post #710356 27th Jan 2025 6:16pm
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Philip



Member Since: 05 Jan 2010
Location: UK
Posts: 2587

2019 Range Rover Autobiography SDV8 Aintree Green

Theyā€™re more refined and more economical, with similar performance (well, D350 vs SDV8). Havenā€™t driven V6 a diesel L405 much, but Iā€™d go for the V8 in preference to the V6 every time.

Post #710695 31st Jan 2025 2:01pm
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Chalky



Member Since: 10 Feb 2018
Location: Marshfield, Bath
Posts: 909

United Kingdom 

I've always had V6 3L engines and the latest D300MHEW is brilliant. It's smooth, quick, economical and quiet. At more than Ā£6k under the D350 it's great value and unless I was towing I wouldn't have anything else. All LR cars from 1984
2021.5 Vogue SE D300 Carpathian Grey
2018 Vogue SE British Racing Green GONE

Post #710702 31st Jan 2025 4:21pm
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northernmonkeyjones



Member Since: 24 Mar 2012
Location: derby
Posts: 8672

United Kingdom 2016 Range Rover Autobiography SDV8 Santorini Black

Iā€™ve got the D300 in the disco and it is a lovely smooth engine. Definitely worth looking at, but make sure itā€™s serviced regularly. There is nothing that can't be fixed with a hammeršŸ˜œšŸ˜œ
FFRR 4.4 SDV8 Autobiography Santorini Black.
KIA E-Niro 4+
2021 Discovery 5 D300 MHEV commercial

Post #710751 1st Feb 2025 11:57am
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DaveBL405



Member Since: 26 Sep 2024
Location: Hampshire
Posts: 27

United Kingdom 2019 Range Rover Autobiography SDV6 Balmoral Blue

Philip wrote:
Theyā€™re more refined and more economical, with similar performance (well, D350 vs SDV8). Havenā€™t driven V6 a diesel L405 much, but Iā€™d go for the V8 in preference to the V6 every time.


What mpg do you get out of interest?

Post #710795 1st Feb 2025 9:07pm
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Chalky



Member Since: 10 Feb 2018
Location: Marshfield, Bath
Posts: 909

United Kingdom 

The true mpg(not what the car says!), for the D300 in my car (which is mostly under 20 mile trips), is 30.7. True mpg on long motorway trips is about 38 All LR cars from 1984
2021.5 Vogue SE D300 Carpathian Grey
2018 Vogue SE British Racing Green GONE

Post #710833 2nd Feb 2025 1:14pm
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DaveBL405



Member Since: 26 Sep 2024
Location: Hampshire
Posts: 27

United Kingdom 2019 Range Rover Autobiography SDV6 Balmoral Blue

What was the car reading for mpg then?

Coming out of a twin turbo X7 40d I was surprised how big the difference with the D300 is - my X7 would get me mid 30s on the school run, whereas the RR Iā€™m lucky to get more than late 20s for the same drive.

Post #710876 2nd Feb 2025 8:24pm
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Chalky



Member Since: 10 Feb 2018
Location: Marshfield, Bath
Posts: 909

United Kingdom 

Anything from 4 to 5 mpg more Whistle All LR cars from 1984
2021.5 Vogue SE D300 Carpathian Grey
2018 Vogue SE British Racing Green GONE

Post #710879 2nd Feb 2025 8:59pm
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Gremlin500



Member Since: 11 Mar 2022
Location: Newcastle, UK
Posts: 1558

United Kingdom 2017 Range Rover Vogue TDV6 Corris Grey

Interesting.
I get typically 27-30 mpg from my TDV6 chugging around town, and late 30ā€™s on a cross-country run.
Iā€™m a bit shocked and disappointed that the D300 MHEV gets exactly the same, I would have imagined it would do 10mpg better in all circumstances, and a D300 had been my next possible port of call, so to speak. Whatā€™s the point of hybrid, if there are no significant gains in economy? Sad

What about the longevity of the HV batteries, and cost to replace? Nobody seems to factor in EV costs in terms of Ā£ per mile including replacing batteries. Iā€™d like to see a Government mandatory ā€œcost per 100,000 milesā€ ticket on the windscreen of all new cars.

I suspect if there were, none would be sold. ā€œIf it ainā€™t broke, donā€™t fix itā€ -whereā€™s the fun in that?

Post #710885 2nd Feb 2025 11:39pm
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GraemeS



Member Since: 06 Mar 2015
Location: Wagga area
Posts: 2550

Australia 2012 Range Rover Autobiography TDV8 Bournville

Is the MY21.5 L405 D300/D350 MHEV? If it is then it's off my list.

Post #710887 3rd Feb 2025 12:56am
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Rob99



Member Since: 03 May 2016
Location: Gatwick
Posts: 1447

United Kingdom 

All D300/D350 are MHEV and, I believe, so are the petrol Ingenium variants (but not the V8 petrols). 2021 D350 Fifty Edition - Carpathian Grey
2017 4.4 SDV8 Autobiography (2021-2024) - Santorini Black
2012 4.4 TDV8 Westminster (2016-2021) - Santorini Black

Post #710888 3rd Feb 2025 1:01am
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GraemeS



Member Since: 06 Mar 2015
Location: Wagga area
Posts: 2550

Australia 2012 Range Rover Autobiography TDV8 Bournville

Thanks. I was starting to suspect they are.

Edit: Will they still run with a failed or even n/a HV battery?
and another: 14 Li-ion batteries in a pack so only little, but still an extra fire risk that really only contributes in city driving.

Post #710889 3rd Feb 2025 1:39am
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Philip



Member Since: 05 Jan 2010
Location: UK
Posts: 2587

2019 Range Rover Autobiography SDV8 Aintree Green

No chance a mild hybrid is going to be much more economical, let alone a third better - the battery is tiny and it never actually runs only on electric.

Post #710890 3rd Feb 2025 3:00am
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