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  1. GL4 GL5 transmission oils

    The Classic Alfa Romeos
    I ordered GL5 oils for my S2 Spider, diff. and 'box. My mechanic says that GL5 is bad for the diff...and he thinks the gearbox may have brass in it too, and better not to use it, but use GL4 oils?
  2. difference between Redline GL4 and GL5?

    The Classic Alfa Romeos
    I need to do some oil changes and will go for Redline 75/90 NS for the gearbox. For the differential there seems to be a choice between RED LINE Synthetic Gear Oil 75W-90 GL5 and RED LINE Synthetic Manual Transmission 90 MT90 75W-90 GL4. Which should I opt for?
  3. Recommended gearbox oil for an '04 GT JTD? GL-4, GL-5, GL4+?

    Alfa 147, 156 & GT
    Hi all from Spain I'm the owner of an Dec '04 GT JTD with 160k km on the clock. Gearbox oil was changed a few thousand miles ago but I noticed reverse gear being quite difficult to select. It gets easier selecting another gear before engaging reverse, without stop pressing the clutch. Also the...
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