I've been having "notchy" shifting recently on my '14 mirage 5 speed with 38,000 miles. I've tried adjusting the clutch but not much improvement. I think I need to change the gear oil. Seems straight forward, until I tried to buy 75w80 gear oil. Napa has some for $36 a quart(!) but they'd have to get it shipped in.
Are all 75w80 oils this expensive?
Can I use a 75w90 weight oil w/ GL4 and GL5 ratings? (This is readily available and more reasonably priced)
Thanks for any ideas about this.