1.3L (1290cc) SOHC I4 (Weber carburetor)โ€ขRWDโ€ขMANUALโ€ขgas
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor โ€” $99 โ†’
Fluid ยท Manual Transmission

Manual Transmission

for 1978 Fiat X1/9 1.3L (1290cc) SOHC I4 (Weber carburetor) ยท RWD
Fluid Type
80W-90 GL-4 gear oil
Spec: API GL-4
Capacity
3.2qt
3.03 L
Drain & Refill
3.2 qt
3.03 L
Change Interval
30,000 mi
48,270 km

Notes

Do not use GL-5, which can damage brass synchronizers

Other fluid systems on this vehicle

๐Ÿ”ง Database maintained under the daily editorial review of Chris Hackleman ยท Master Technician ยท 20+ years. Spot an error? Use the Help link above โ€” a human reads every report.
Stuck on this repair? Take it to The Diag Desk โ€” ask a master tech about this exact car โ†’ real human answer within 24h, never AI
โš  STILL BEHIND THE PAYWALL
The 1978 Fiat X1/9 repair data is incomplete because no one has sponsored it yet. For $99, we generate the full step-by-step procedures, then fact-check them with a second AI pass and your expert review. Your name on every procedure, permanently.
The same data would cost $169/mo from Mitchell1 or $30/year from ALLDATAdiy โ€” and you'd be renting access, not freeing it. Sponsor once, free forever.
Sponsor the Fiat X1/9 โ€” $99 โ†’
Building an app?
Free API access to all this data โ€” 10 requests/day, no card required.
Get an API key โ†’
Run a shop?
Manage repairs, estimates, and customers with ShopBase โ€” $249/mo, all features included.
Try ShopBase โ†’