Diff oil

[vxkev]

So after a lot of people saying on the GTO FB page that royal purple should be given a miss, I decided to drop the stuff out of my diff and replace with Castrol syntrax and some Redline modifier and what a massive difference, so much quieter and no knocking, should have done it when I replaced last year won't be using royal purple ever again.

[THUNDER STORM]

vxkev said:

So after a lot of people saying on the GTO FB page that royal purple should be given a miss, I decided to drop the stuff out of my diff and replace with Castrol syntrax and some Redline modifier and what a massive difference, so much quieter and no knocking, should have done it when I replaced last year won't be using royal purple ever again.

I noticed same, Royal purple is a no no caused me problems when used in my Monaro

Ade

[mfp4073]

THUNDER STORM said:

I noticed same, Royal purple is a no no caused me problems when used in my Monaro

Ade

OK guys, this is a new one! What are the problems with Royal Purple?

[vxkev]

mfp4073 said:

OK guys, this is a new one! What are the problems with Royal Purple?

It attacks the soft metal parts in the diff that causes diff problems

Edited by vxkev on Friday 15th September 20:18

[mfp4073]

vxkev said:

It attacks the white metal parts in the diff that causes diff problems

Well I've never heard of that before, I wonder if that's affecting my Truetrac?
I might just change the oil to an old mineral type and see what happens.

[fred bloggs]

My diff was knocking a bit,so i changed the oil (castrol)and it went quiet,but wasnt locking reliably. I bought a kaaz to be sure.



When I pulled the stock diff carrier out this is what greeted me. I didnt see any white metal in there ;-)




So yea I was glad I bought the kaaz, It was very harsh at first,but now its bedded its lovely. 2nd car ive put a kaaz in.

[Superhans_]

How much are they? What's the p/n?

[MyM8V8]

mfp4073 said:

Well I've never heard of that before, I wonder if that's affecting my Truetrac?
I might just change the oil to an old mineral type and see what happens.

Its in the FAQ's I posted. You cant use any oil with a friction modifier in Helical diffs!

[mfp4073]

MyM8V8 said:

Its in the FAQ's I posted. You cant use any oil with a friction modifier in Helical diffs!

I will check, thanks.

[GrumpyV8]

vxkev said:

So after a lot of people saying on the GTO FB page that royal purple should be given a miss, I decided to drop the stuff out of my diff and replace with Castrol syntrax and some Redline modifier and what a massive difference, so much quieter and no knocking, should have done it when I replaced last year won't be using royal purple ever again.

Would this be Castrol Syntrax 75W 140 by any chance? Can you give a clue as to how much Redline modifier you added please? Ta

[vxkev]

GrumpyV8 said:

Would this be Castrol Syntrax 75W 140 by any chance? Can you give a clue as to how much Redline modifier you added please? Ta

Yes mate I put 1 ltr of the syntrax 75w 140 in first then 1/2 of a 4oz bottle of modifier then topped up with the second bottle of syntrax

[altoplanohombre]

mfp4073 said:

vxkev said:

It attacks the white metal parts in the diff that causes diff problems

Well I've never heard of that before, I wonder if that's affecting my Truetrac?
I might just change the oil to an old mineral type and see what happens.

Neither have I.........and there is no white metal in a Monaro diff.
I've use Royal Purple in my Monaro for 65k miles and it's still running sweet at 113k miles.
Monkfish were users of Royal Purple - good enough endorsement for me.

to Royal Purple.