sierrafery
Well-Known Member
Better put 75W90 gear oil recommended by LR though, there's no extreme pressure in the diffs to use different spec EP stuff
jamesmartin
Well-Known Member
theres a fair bit between the crown wheel and pinion teeth, and ep is quoted for other models using the same diff
sierrafery
Well-Known Member
I know EP90 was recommended for D1s and RRCs then from D2 LR started to recommend 75W90 for diffs and transfer case, maybe they've got smarter 
... from all the advertisings i've seen EP was recommended for various gearboxes not for diffs... but i'm not gonna contradict the masters on this
... from all the advertisings i've seen EP was recommended for various gearboxes not for diffs... but i'm not gonna contradict the masters on this
jamesmartin
Well-Known Member
they dont choose oil or service interval lengths for its ability to give a vehicle a 10 year plus life as most of us would hope ,i think the fact 75w/90 is thinner and still able to offer enough lube was more likely reason, ep oils are for high pressure applications a crown wheel and pinion been a good exampleI know EP90 was recommended for D1s and RRCs then from D2 LR started to recommend 75W90 for diffs and transfer case, maybe they've got smarter
sierrafery
Well-Known Member
So you say the EP90 is better?
I know EP90 was recommended for D1s and RRCs then from D2 LR started to recommend 75W90 for diffs and transfer case, maybe they've got smarter
EP 90 is primarily diff oil. But does have other applications. Multigrade 75W 90 is specified as is any oil meeting the API GL5 specs.. There is EP 90 that meets this spec. Therefore it can be used.
sierrafery
Well-Known Member
Now all i want to know is which is better for the diffs and transfer case of a D2 cos i want the best for my car that's why in most cases(unless i know different for sure) i'm using what the builder recommends but i can be convinced with serious arguments to use other stuff if it's better.... like for example when it comes to engine oil
DeanoD2TD5
Member
Gearbox mtf94/atf94
Diffs and transfer box 75w90
For PAS and ACE use the extreme climate LR issued.
Diffs and transfer box 75w90
For PAS and ACE use the extreme climate LR issued.
Catweazle64
Member
Views?
The dealer book for my LR discovery 2 2004 manual says to use Castrol Syntrax 75w 90 in both diffs and transfer box my question is this:
Castrol - £16 per litre
Comma SX 75w 90 GL 5 high performance- £6.40 per litre (£32 for 5 litres)
Triple QX 75w 90 - £8 per litre
They all conform to GL5
Castrol obviously expensive but is it the best?
Thanks
The dealer book for my LR discovery 2 2004 manual says to use Castrol Syntrax 75w 90 in both diffs and transfer box my question is this:
Castrol - £16 per litre
Comma SX 75w 90 GL 5 high performance- £6.40 per litre (£32 for 5 litres)
Triple QX 75w 90 - £8 per litre
They all conform to GL5
Castrol obviously expensive but is it the best?
Thanks
Last edited:
sierrafery
Well-Known Member
Any synthetic 75W90 is good the brand is not so relevant
Catweazle64
Member
The Comma is winning on price but is semi synthetic does it have to be fully synthetic as the Castrol is?
sierrafery
Well-Known Member
It doesnt HAVE to be fully synth but it's better, if you know you are changing it regularly your choice though the lubrication is not the area where it's good to save all the money
Catweazle64
Member
So, as long as it's 75w 90 fully synthetic and changed about once a year all should be good then. Comma do a fully synthetic too but eurocarparts are doing a deal on the Triple QX fully synthetic so will probably get that instead.
Mr S1 - I've not come across Ep so will stick to 75w 90 as per book.
Mr S1 - I've not come across Ep so will stick to 75w 90 as per book.
jamesmartin
Well-Known Member
old fashioned mineral oil is more than adequate,its basically the same diff theyve used for decades, especially if changing much more regularly than lr recommend which is far too long imo the synthetic might last the miles of extended changes but it still carries the contaminants
