80W90 vs 75W90
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Junior Member
Joined: Oct 2012
Posts: 29
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From: California
80W90 vs 75W90
So i'm looking up different gear oils for my 88 FC. now the manual suggests 80W90 gear oil. but i found this oil on Mazdatrix "Idemitsu Racing Gear Oil" but it only comes in 75W90. Would this still be sufficient lubrication? Have any members ever tried this brand?
>>>>>check it out>> https://www.mazdatrix.com/q-supply.htm
>>>>>check it out>> https://www.mazdatrix.com/q-supply.htm
Rotorhead
Joined: Feb 2001
Posts: 9,136
Likes: 39
From: Charlottesville, Virginia, USA
Most synthetic oil is 75W-90 rather than 80W-90, and it will flow better in cold weather. Idemitsu is a good brand, but I have never tried it because Red Line was always less expensive whenever I was shopping for gear oil. I can't recall whether the Idemitsu gear oil is intended for LSD or non-LSD differentials, so you should check with the vendor to see if you will need to add a friction modifier.
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