Re: Transmission oil
That's the catch you have to watch out for on GL5 gear oil, most of them will say backwards compatible with GL4. BUT, that is referring to the lubrication properties, NOT the synchronizer compatibility. Most (if not all) GL4 gear oils should state synchronizer compatible, but anything labeled GL4/GL5 I would question. Now, some of the newer GL5s claim synchronizer compatible, which they may well be, but I would stick with GL4. GL4 has been used in synchronizer transmissions for years.
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