911 2

My diff became noisy when i changed the oil to mobil1 75/90 oil, I know the diff is fine as it happened literally after replacing the oil
I have been told i should use a LS 90 oil, any recommendations on which brand to use, I am based in the UK
When looking for a LS 90w oil are gear and diff oil the same and will it be a synthetic oil I should be looking for

Metal Guru

Mobil 1 LS 90. The "LS" stands for limited slip. It has slip agent in it.
Either add slip agent to what you have or change to LS 90.

911 2

if mobil do one i will change to LS 90 but cant seem to find it, can only find the 75/90 gear oil
any idea how much I need changed myn a while ago

Metal Guru

If you can't get LS where you live you will have to get slip agent in additive form and add it to your gear oil.

911 2

Unable to find any mobil ls90 is the slip agent a liquid, im assuming some of the diff oil has to be drained first

Metal Guru

Search Google for differential limited slip additive. There are many manufacturers.
No, don't drain your gear oil. Just put the additive in.

911 2

will do thanks

wicks

I put this in mine, smoothed it out noticeably:

Igooz

This is what I have used in another car. It does not take much.
https://www.redlineoil.com/limited-s...ction-modifier

There are debates about what friction modifier to use if your gear oil is dino-based or synthetic.

911 2

thanks only want to use what you guys have tested and know is ok for the box

urquattro20Vt

How much did/do you put in? 1 bottle? or?

Thanks

Brandon