Difference between GL4 and GL4+ ??

[FCD]

Is it ok to use GL4+ in place of GL4 in a manual transmission that uses brass synchros?
I've read that
GL5 has phosphorous
GL4 has 1/2 that of GL5
And that GL4+ has none at all? is this true?

 

[Jimzz]

Never heard of GL4+. Where did you see that listed?

 

[FCD]

A local parts store chain called Norauto here in Spain sells their own, it's 75W-80 and labeled API GL-4+

 

[Popsy]

It's probably the same as the Total 75W80 GL4+. Judging by the smell...must have something other "synthetic" gear oils don't have, it has the typical smell pf gear oils, old school style.
If it's really brass synchros, I'd stay with GL4 like the Castrol Syntrans multivehicle or similar, although I'm pretty sure the GL4+ should be yellow metal safe.

Also Norauto prices are generally not very good, unless you have some specials maybe ? Géant casino has generally better prices and pretty much same products...don't know if you have that in Spain.

 

[zeng]

Originally Posted by FordCapriDriver
Is it ok to use GL4+ in place of GL4 in a manual transmission that uses brass synchros?
I've read that
GL5 has phosphorous
GL4 has 1/2 that of GL5
And that GL4+ has none at all? is this true?

By none you mean none of old school sulphur-phosphorous compound EP additives ?

 

[MolaKule]

GL-4+ doesn't exist as a valid SAE/API Gear Oil designation so anytime that designation is used it's an advertising ploy.

https://www.bobistheoilguy.com/foru...bology-and-lubrication-part-i#Post729255