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#5: 08-28-2012, 05:04 PM
FJuan's Avatar
Title: Ayyyyyyyy
Rank: Donating Member
Location: Fresno, the armpit of CA
Car: 2017 Mazda 6
Posts: 32,815
iTrader: (3)
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Tust me on this, don't use Castrol synthetic 75/90, you will get the famous 4th gear grind. I've used this before, along with several other members, and most of us started having this problem. Once I switched back to Subaru Extra-S, the problem was fixed. Gear box is smooth as butter. I bought mine off of ebay, and some of the vendors on here sells it as well.

No need for a flush, just drain and fill. Same with the rear diff.