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?
I've read that
GL5 has phosphorous
GL4 has 1/2 that of GL5
And that GL4+ has none at all? is this true?