I am just about to change the cleveland in my GT5S for a windsor 392 stroker and wamt to change fluid in the ZF. Castrol market different oils in Ireland, the 80w90 is "EPX" and says on the pack not suitable for limited slip diffs!! The local motor shop has suggested castrol hypoy LS which is a w90 API GL5 gear oil. What you think as it will be a special order for me?
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