GL-5 Transmission Oil - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

MrMigs · 12-10-2001, 06:43 PM

The manual said to use GL-4 transmission oil for my Manual Transmission.

How harmful would using GL-5 oil be?  Would it even be harmful at all?

chickenmanq · 12-10-2001, 08:43 PM

Doubt it.  Just make sure it's the same weight.  (75-90 etc.)  Get a good quality oil and don't worry about it.  Valvoline, or Mobil 1 Synthetic, I'd choose for the tranny.

misnomer · 12-11-2001, 12:27 AM

don't think it's really an issue. West is using GL5 if I remember correctly

allmotorKA · 12-11-2001, 02:19 AM

The general rule is that GL-5 gear oil should NOT be used unless your owner's manual specifically recommends it. This is because some of the additives used in GL-5 gear oil will attack brass, bronze, copper used in gearbox bearings and bushings. Some additives will also attack the rubber and plastic in the bearing seals.

I know some 240SX owners have used GL-5 oil in their manual tranny without any problems but I would still caution against it.

12-10-2001, 06:43 PM	#1
MrMigs Nissanaholic! Join Date: Jul 2001 Location: San Gabriel, CA Age: 41 Posts: 1,675 Trader Rating: (5) Feedback Score: 5 reviews	The manual said to use GL-4 transmission oil for my Manual Transmission. How harmful would using GL-5 oil be?  Would it even be harmful at all?

12-10-2001, 08:43 PM	#2
chickenmanq Zilvia FREAK! Join Date: Nov 2001 Posts: 1,000 Trader Rating: (0) Feedback Score: 0 reviews	Doubt it.  Just make sure it's the same weight.  (75-90 etc.)  Get a good quality oil and don't worry about it.  Valvoline, or Mobil 1 Synthetic, I'd choose for the tranny.

12-11-2001, 12:27 AM	#3
misnomer Nissanaholic! Join Date: Jul 2001 Location: Nevada Posts: 2,293 Trader Rating: (0) Feedback Score: 0 reviews	don't think it's really an issue. West is using GL5 if I remember correctly

12-11-2001, 02:19 AM	#4
allmotorKA Zilvia Member Join Date: Nov 2001 Location: SoCal Posts: 204 Trader Rating: (1) Feedback Score: 1 reviews	The general rule is that GL-5 gear oil should NOT be used unless your owner's manual specifically recommends it. This is because some of the additives used in GL-5 gear oil will attack brass, bronze, copper used in gearbox bearings and bushings. Some additives will also attack the rubber and plastic in the bearing seals. I know some 240SX owners have used GL-5 oil in their manual tranny without any problems but I would still caution against it.