Gallardo diff oil
Discussion
EpsomJames said:
Good to see you still have the Nera, Simon 
Checking through some of my old service invoices my dealer put AGIP Rotra LSX SAE 75W90 in my SL. I have no unusual noises from the transmission.
I recently put this in my 360 and it’s now Eni Rotra LSX if you’re googling. Available from Superperformance or their sister co Motoworld and very few other places it seems. It seems better than the Shell that’s been used in the past.Checking through some of my old service invoices my dealer put AGIP Rotra LSX SAE 75W90 in my SL. I have no unusual noises from the transmission.
hi James. yes still have the nera. I have had quite a few replies as it is a very common problem. the general consensus is the spec needs to be 75w90 minimum and not BURMAH 70W-75 as specified in the handbook. it's not heavy enough.
there are plenty available and i will list all the recommended ones on here tomorrow for future reference.
there is also some that say adding a modifier will work if the diff is still noisy after filling with 75w90. I will investigate this further. I know red line do both the 75w90 and the modifier.
i spoke to Opie oils and lamborghino chelmsford today and both of them are looking into it as neither are certain lololol
there are plenty available and i will list all the recommended ones on here tomorrow for future reference.
there is also some that say adding a modifier will work if the diff is still noisy after filling with 75w90. I will investigate this further. I know red line do both the 75w90 and the modifier.
i spoke to Opie oils and lamborghino chelmsford today and both of them are looking into it as neither are certain lololol
Possibly James but it appears that some people use this oil without issues. It really seems to depend on what your own transmission is "happy" with!!
This is what I have found out so far and I will update for future reference.
Burmah 70w75 is what is specified in the handbook which is rarely used by main dealers or independents. The independents that do use it do so in conjunction with a modifier – the Jaguar modifier is popular but doesn’t seem to work with all cars.
These are the specs which have been recommended on various forums/emails etc. The general consensus is that GL 4 should be used and not GL 5 but Opie are checking this for me as are Lamborghini Chelmsford. I will update when they come back to me.
AGIP Rotra LSX SAE 75W90 now Eni Rotra LSX or Rotrex S/SX 75w90. (I am checking with Lamborghini Chelmsford to see if this is what all main dealers use now) Apparently it’s quite hard to get hold of.
Redline MT90 75w90 (GL 4). This has been recommended by many especially in the States and is by far the most recommended oil on the forums
Redline MT90 75w90 (GL 5). Opie are checking this too as it is GL 5.
Redline MTL 75w80 (GL 4). This is probably too thin so for LP cars only
Royal Purple 75w90 ( This has good reviews too)
Mobil 75w90 (GL 5) Again a GL 5 fluid
Motul gear 300 LS 75w90 (Currently Opie are looking into this as it is specifically designed for limited slip diff- however it is a GL 5 so may not be suitable)
VW G052171A2.It would appear that this is the same spec as the Burmah oil above.This would make some sense as Lamborghini are owned by VW. Some say this is for LP cars and pre LP manual cars only and is too light for pre LP egear cars. If used on pre LP egear cars then Mopar Fluid 4318060AC limited slip diff modifier should be used (1 bottle)
One guy has also recommended Pakelo oil which comes in two parts – the diff oil and the friction modifier – i am waiting for the spec on this.
This is what I have found out so far and I will update for future reference.
Burmah 70w75 is what is specified in the handbook which is rarely used by main dealers or independents. The independents that do use it do so in conjunction with a modifier – the Jaguar modifier is popular but doesn’t seem to work with all cars.
These are the specs which have been recommended on various forums/emails etc. The general consensus is that GL 4 should be used and not GL 5 but Opie are checking this for me as are Lamborghini Chelmsford. I will update when they come back to me.
AGIP Rotra LSX SAE 75W90 now Eni Rotra LSX or Rotrex S/SX 75w90. (I am checking with Lamborghini Chelmsford to see if this is what all main dealers use now) Apparently it’s quite hard to get hold of.
Redline MT90 75w90 (GL 4). This has been recommended by many especially in the States and is by far the most recommended oil on the forums
Redline MT90 75w90 (GL 5). Opie are checking this too as it is GL 5.
Redline MTL 75w80 (GL 4). This is probably too thin so for LP cars only
Royal Purple 75w90 ( This has good reviews too)
Mobil 75w90 (GL 5) Again a GL 5 fluid
Motul gear 300 LS 75w90 (Currently Opie are looking into this as it is specifically designed for limited slip diff- however it is a GL 5 so may not be suitable)
VW G052171A2.It would appear that this is the same spec as the Burmah oil above.This would make some sense as Lamborghini are owned by VW. Some say this is for LP cars and pre LP manual cars only and is too light for pre LP egear cars. If used on pre LP egear cars then Mopar Fluid 4318060AC limited slip diff modifier should be used (1 bottle)
One guy has also recommended Pakelo oil which comes in two parts – the diff oil and the friction modifier – i am waiting for the spec on this.
monkeysandbears said:
Redline MT90 75w90 (GL 4). This has been recommended by many especially in the States and is by far the most recommended oil on the forums
Redline MTL 75w80 (GL 4). This is probably too thin so for LP cars only
I have used both these oils in the diff on my car and found the best to be the Redline MT90 75w90 (GL 4) with the addition of some Redline Friction Modifier.Redline MTL 75w80 (GL 4). This is probably too thin so for LP cars only
When I collected the car after this was used, though I knew well fine, if the garage had told me they'd fitted new diff's all round I would have believed them. Night and day difference, silent and smooth.
Pau1 said:
I have used both these oils in the diff on my car and found the best to be the Redline MT90 75w90 (GL 4) with the addition of some Redline Friction Modifier.
When I collected the car after this was used, though I knew well fine, if the garage had told me they'd fitted new diff's all round I would have believed them. Night and day difference, silent and smooth.
This is the recommendation that most people are coming up with. Do you know how much modifier you put in. I think the diff takes just over 4litres in totalWhen I collected the car after this was used, though I knew well fine, if the garage had told me they'd fitted new diff's all round I would have believed them. Night and day difference, silent and smooth.
monkeysandbears said:
This is the recommendation that most people are coming up with. Do you know how much modifier you put in. I think the diff takes just over 4litres in total
From their siteRecommended Dosage:
Use 4% for prevention of limited slip chatter in broken-in units (typical one 4 oz. bottle) or 4 to 8% for the break-in of new differentials.
mike01606 said:
Eni Rotra LSX is also a GL5 oil
You are quite correct - it is GL5. The gearbox needs GL4 and the diff needs GL5 but because the oil is shared you cant have both. It would also appear that the newer GL5 oils have extra additives to prevent damage to the synchros.Based on the below email from Tim at Opie oils I am going for the redline NS and bring the weight back with the friction modifier until the diff noise stops. I know the diff is ok because it was quiet before the work was carried out. I will post up once I have changed the oil.
This is the reply from Tim at Opie oils. As usual from Opie the advice is excellent!!!!!
Hi Simon
I would use a 75w-90 rather than the 70w-75, but there seems to be some confusion about the specs. The synchros in a gearbox want a GL4 oil, but the diff wants a GL5 as the GL4 level of additives help to slow the synchros for changes. The diff wants the GL5 level of pressure additives to protect due to the high pressure generated in the diff.
I spoke to one of the oil companies a while ago about the Rotra LSX as it was something I hadn't heard of and when I was searching for it, it was listing commercial vehicles. It turns out that the Rotra LSX is primarily aimed at heavy off road vehicles, like the big dumper trucks used in quarries, rather than high performance cars.
The two oils I would look at using are the Motul Gear 300 or Red Line 75w-90NS (rather than the MT90 as it is a GL5, but aimed at gearbox use). Those two oils are very well proven in Porsche and Ferraris, where the oil is shared between the gearbox and diff. There are a couple of Gallardos I can think of that use it as well.
https://www.opieoils.co.uk/p-899-motul-gear-300-75...
https://www.opieoils.co.uk/p-1017-red-line-synthet...
In most cases, they work fine and do not need any additional friction modifier, but if your diff is noisy, I suspect it will need the modifier and the Red Line one is ideal.
https://www.opieoils.co.uk/p-6320-red-line-limited...
You need to be careful with the friction modifier, too much will lead to the diff slipping more than you want and it will prevent the synchros from slowing enough, leading to poor changes. Too little modifier and it will still be noisy and the diff too keen to lock up. I would add it a quarter of a bottle at a time, then take the car out and test it, so you will find the correct level. That's basically how the Pakelo stuff would work (although I have no idea about their oils, we don't get them over here to my knowledge).
Regards
Tim
Well today is the day that we change the diff/gear oil.
We drained out the existing oil (agip) and poured in 4.25 quarts (4 litres) of RED LINE Synthetic Gear Oil 75W-90NS GL5 (non Limited Slip) and 50ml of RED LINE Limited-Slip Differential Friction Modifier / Break-in Additive.
We were all very surprised to see that the oil was no thicker than normal engine oil and even more concerned that the modifier was no thicker than 3in1. Much head scratching about just how this was going to work!
I can now confirm that me being a sceptical sod and bearing in mind the terrifying noises coming from the diff that I have well and truly been SILENCED. There is a first time for everything. The difference is night and day. The really worry graunching and grinding coming from the diff on slow uphill corners has gone! The chattering on sharp downhill corners has gone! The whirring and ticking when pulling away in a straight line has gone!
And to cap it all he gear change is unbelievably slick and I mean properly noticeably slick!
I am quite shocked TBH - how on earth can just changing the oil make such a huge difference????
A big thanks to Tim at Opie Oils and to Roberto and the boys at Grimaldi Engineering. Not a bad day for Friday the 13th.
Its alchemy that's what it is !!!!!!!!!!!!!!!!!!!!!
We drained out the existing oil (agip) and poured in 4.25 quarts (4 litres) of RED LINE Synthetic Gear Oil 75W-90NS GL5 (non Limited Slip) and 50ml of RED LINE Limited-Slip Differential Friction Modifier / Break-in Additive.
We were all very surprised to see that the oil was no thicker than normal engine oil and even more concerned that the modifier was no thicker than 3in1. Much head scratching about just how this was going to work!
I can now confirm that me being a sceptical sod and bearing in mind the terrifying noises coming from the diff that I have well and truly been SILENCED. There is a first time for everything. The difference is night and day. The really worry graunching and grinding coming from the diff on slow uphill corners has gone! The chattering on sharp downhill corners has gone! The whirring and ticking when pulling away in a straight line has gone!
And to cap it all he gear change is unbelievably slick and I mean properly noticeably slick!
I am quite shocked TBH - how on earth can just changing the oil make such a huge difference????
A big thanks to Tim at Opie Oils and to Roberto and the boys at Grimaldi Engineering. Not a bad day for Friday the 13th.
Its alchemy that's what it is !!!!!!!!!!!!!!!!!!!!!
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