Castrol Saf-Xj 75-140 oil got wider temperature range than 80-90, 80-90 is inside that range. i still recommend to use this Castrol, it have already enough LSD additive in it.. that oil will work better in really hot and really cold than 80-90. 80-90 is mineral and 75-140 is Fully synthetic. also this Castrol got that high pressure additive in it (enough)
I got Kaaz in my celica, and it never work properly with Kaaz oil, there was snapping noise just like what you had (it work when rear was cold). had to add some LSD additive more. also TRD in my carina, both 6.7" that Castrol just beat those old mineral oils... work always and really smooth !!
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