Part No. Required

[cleverdick]

Hi all,

The other day I replaced my diff oil with Redline 75W90. Right now I'm not convinced this was a good move as I believe I can now detect an increase in noise from the rear of the car.

I was not expecting this, but I have read elsewhere of people switching to synthetics and experiencing similar trouble.

I should have lived by my theory that it's always best to use OEM, regardless of what's claimed.

So, I need the part number of the genuine Toyota gear oil that was used in these diffs as OE. (I won't sleep until I've put this right!)

Anyone able to help?

Thanks,

Rich

[Chris.S]

I have a feeling you've put the wrong grade oil in your diff

75/90's is normally for manual gearboxes. Diff oils are often 85/90's or LSD oil if its a limited slip diff

[cleverdick]

I have a feeling you've put the wrong grade oil in your diff

75/90's is normally for manual gearboxes. Diff oils are often 85/90's or LSD oil if its a limited slip diff

Thanks Chris,

It is (supposedly) for diffs and says all the right stuff : i.e. API GL-5 etc. It also has a friction modifier for LSDs (which the LS400's isn't) but claims that it's good for non-LSDs too.

I just can't believe that the service departments of main dealers dispense generic fluids - even Sewell Ft. Worth use Castrol! So much for diligently following the service schedule and using OEM parts! All I wanted was whatever was put in at the factory. Maybe that's too much to ask!

I do have part number for Toyota 85/90 (which I believe is a mineral oil) but I don't know if this meets EP requirements. Either way, Lexus Southend claim that I'd have to pay for a whole crate from Japan. They did offer me some Shell Spirax semi-synthetic 80W/90 which I declined.

So, in the meantime I've bought some cheap Carlube EP90 mineral, which again claims to meet API GL-5. At least it's the grade recommended by the book. Hoping to put it in sometime over the next few days. Can't be any worse!