datzenmike Posted December 28, 2016 Report Share Posted December 28, 2016 I guess read the Lucas label or contact them about being compatible with copper/brass/bronze alloys. Quote Link to comment
dndgib Posted August 19, 2017 Report Share Posted August 19, 2017 My question is on the same lines but with regards to gear oil weight. I live in southern AZ and do some 1 1/2 hour highway driving during the summer where the temp gets to 115f ambient. I am concerned about trans and diff temps so I am thinking 85w140. It doesn't really get cold here so I am not overly concerned about the lower temp thickness. Does anyone have any recommendations for gear oils in this region of the hot ass SW? Quote Link to comment
datzenmike Posted August 19, 2017 Report Share Posted August 19, 2017 140 w is good to 50F and is a bit thick below that till it warms up from use. Probably ok in the diff. Get and us GL5 if you do. 140 w in a transmission may cause hard shifting when cooled down or cold. I would look at GM Delco Synchromesh Transmission oil. It's GL-4 rated, synthetic so very resistant to heat breakdown and quite thin so easy shifting when cool or cold. I used it last winter at about -5C or 20F with no noticeable changes. Quote Link to comment
G-Duax Posted August 20, 2017 Report Share Posted August 20, 2017 I just got done changing both trans & diff out to 85w140, since it's rather warm here in Texas. Quote Link to comment
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