hi all members i asked for sutiable gearbox fluid that i want to change i found 2 products from luqi moly but i dont wich one is recommended for felicia gear box

 

1-High Performance Gear Oil (GL4+) SAE 75W-90 https://products.liqui-moly.com/high-performance-gear-oil-gl4-sae-75w-90-6.html

2-Hypoid Gear Oil (GL4/5) TDL SAE 75W-90  https://products.liqui-moly.com/hypoid-gear-oil-gl4-5-tdl-sae-75w-90-9.html

thx at all

What country do you live in? I'm asking to see what products you have access to.

4 minutes ago, RicardoM said:

What country do you live in? I'm asking to see what products you have access to.

Egypt and i looking for gl4 oil that is little in my market but i have found luqimoly as i mentioned above but want to be sure which one is sutiable for felicia gearbox

also there is mobil 80w90 in market but i think it dosent fit felicia gearbox

First of all, some theory:

Quote

 

The main difference between GL-4 and GL-5 gear oils is the amount of Extreme Pressure (EP) additives. Sulphur/Phosphorus containing products are used as EP-additive. This additive has the purpose to prevent the occurrence of micro-welds on the gear flanks at the local high temperatures which prevail in EP circumstances (temperatures well in excess of 800℃!) GL-5 has roughly twice the amount of EP additives compared to GL-4, which is why it is often used in high-pressure circumstances such as in a front axle and rear axle differential.

Sulphur/Phosphorus additives however have an unfavourable property: they can react aggressively towards bronze and copper. This can be disastrous for the synchromesh rings of a gearbox. Therefore it is not recommended to use GL-5 in a gearbox unless the manufacturer allows this.

 

And another bit of theory:

Quote

Multigrade SAE gearbox oil grades include two numbers separated by a ‘W’ (75W90, for instance), with the initial number before the ‘W’ indicating performance at 0°C and the number after showing the lube’s performance at 100°C. As with monograde oils, the higher the number, the greater its viscosity.

The conclusion is this:

1. you need a GL4 gearbox oil
2. given you live in a hot weather region, you need a 80W90 oil

My recommendation is to buy 3 liters of this oil:

https://www.mannolegypt.com/products/manual-transmission-oils/universal-80w-90/

14 minutes ago, RicardoM said:

First of all, some theory:

And another bit of theory:

The conclusion is this:

1. you need a GL4 gearbox oil
2. given you live in a hot weather region, you need a 80W90 oil

My recommendation is to buy 3 liters of this oil:

https://www.mannolegypt.com/products/manual-transmission-oils/universal-80w-90/

yes bro i asked about it but didnt found in markets and found another brands but they all are gl5

the only one if found 75w90 is luqimoly full synthetic is it good or not

Use High Performance Gear Oil (GL4+) SAE 75W-90.

48 minutes ago, RicardoM said:

Use High Performance Gear Oil (GL4+) SAE 75W-90.

but i wonder what is the diffrent between gl4 and gl4+

if i found the another one only can it be sutiable or not

GL4+ doesn't exist as a gearbox oil standard. It is just a glorified GL4 oil using the marketing techniques.

6 hours ago, RicardoM said:

GL4+ doesn't exist as a gearbox oil standard. It is just a glorified GL4 oil using the marketing techniques.

you are always the best

thanks

good news i found the product that you mentioned me above but does it worth it to buy fully sencetic oil that is expensive rather than semi sensetic or dont make diffrent in our case

16 hours ago, RicardoM said:

First of all, some theory:

And another bit of theory:

The conclusion is this:

1. you need a GL4 gearbox oil
2. given you live in a hot weather region, you need a 80W90 oil

My recommendation is to buy 3 liters of this oil:

https://www.mannolegypt.com/products/manual-transmission-oils/universal-80w-90/

 

Bigger price higher quality.

As ricardo said use either gl4 or gl4+ but i would not use 75w-90 as it will make shifting into first gear harder, i would use fully sythetic 75w-80