Hi all

I have a 56 plate TDV8 Vogue and wonder what diesel is best in terms of mpg, performance and cleaning properties?

I have ran high performance petrol cars on high octance stuff such as Shell Optimax, Tesco Momentum etc for years with good results and I see that some of the big names offer super diesels.

I put a tank of BP Ultimate diesel in the tank today and was quite shocked to see an 11p per litre price difference so my question is, is the super diesel worth the extra and how does it compare to normal supermarket diesel and also branded diesel from Shell, BP etc?

I've read super diesels are worth the extra but I think the cost increase may be a bit OTT.

I've posted on here about my mpg being a little low hence why I have opted for a change from supermarket diesel into the best of the best so to speak.

Sorry if this is a recurring question, I'm new to V8 diesel power.

Thanks

Carl

Was told just regular diesel by the dealer for my 4.4TDV8. Get really good economy so wouldn't bother spending the extra 11p or so a litre.

Thanks Autobiography, I was there at the pump so filled up today but I'm not sure I'd see much improvement in mpg, performance or refinement to he honest hence my post on here.

Do you use supermarket diesel or branded like Shell, BP etc? I have heard that the supermarket stuff is minimum grade whereas the branded stuff should have additives LOL

dont know whether its been suggested but have a look and see if you have a dirty air filter..

I've checked the air filter, its a bit dirty but not black, it was replaced 2 years ago and approx 18k miles ago so I assume its still ok?

its just that i replaced mine and the mpg went up a bit..worth a try especially after 2 years or take it out for a bit to see if it makes any difference....and i've tried different diesel suppliers with no difference found on my td6..

Superdiesel certainly isn't worth the extra! I used to run on Sainsbury's forecourt diesel but for the last 2 years have run almost exclusively on Shell Regular diesel - after burning 3 full tanks of the Shell my mpg had increaded from 26 to 29 and now I regularly see 31 mpg on my 16 mile drive into town. 2018 Mini Countryman Cooper S E All4 PHEV in Melting Silver - it’s whisper quiet in EV and polluter modes

I may try Shell after this tank then, I know my local Shell garage is more than Tesco but if I can hope to see a 10% increase I think it will be worth it.

I never use supermarket Diesel. I used to use supermarket Petrol but after that issue a few years ago I haven't touched it since. I also seem to get better mpg on Shell/BP etc.

Best thing you can do with a diesel is get some biodiesel mixed in a few 100 miles before its next service, this helps clean out all the gunge in the tank and the system far better than any performance diesel or additive IME and helps bring the car back in line with what it should be like. i'd reccomend putting no more than say 30 litres in to a tank and then topping up with normal diesel as each biodiesel supplier varies in quality from my own experience Some are good and some are just a

Im waiting till pay day this week and getting some in mine as part of my service at home and some other bits i need to do before towing our new monster caravan home

30 litres is too high according to the handbook and will damage the engine. See below:

DIESEL ENGINED VEHICLES
Land Rover recommends that only premium brand diesel fuels are used.
Note: Land Rover vehicles are capable of running with up to a 5% blend of bio-diesel in accordance with European Standard EN590

So only just over 5 litres.

5% is only there because all fuels need to be a 5% bio blend now so no matter what garage you go to its already got a tiny bit of bio in it but not enough to really clean your system out, even 30litres in a tank as big as the FFRR isn't too much really once diluted by another 74.5 litres...

What would it do to your warranty though if you've gone 'against' LR guidelines and it messes up your engine?

It would be flushed out after a few tank fulls after and it would have to be very strange for them to dip your tank to test what was in there. Also the dilution would be such that as you have had the car a while and if a remanent remains whats to say the previous owner hasn't done it?

Its the same with the additives yet people still shove them in the tank, do any of them say on the bottle they won't affect your warranty??

johnson1 wrote:

What would it do to your warranty though if you've gone 'against' LR guidelines and it messes up your engine?