My Subaru WRX requires 70W-80 gear oil for the manual transmission. It needs to be GL-5 since it shares fluid with the front diff. 75W-90 is also acceptable, but it can apparently make shifting really sluggish in cold weather, and I need something good for -40°C.
The Subaru Extra MT is only sold in 5-gallon pails and it's not cheap, so I'm looking for something else. It seems there are only two other options:
Motul Motylgear 75W-80 is a semi-synthetic GL-4/GL-5 MTF. I've heard mixed opinions about whether dual rated GL-4/GL-5 gear oils are as good as dedicated GL-5 for a transmission. I'm also not sold on its cold weather performance. The pour point is only -36°C, and there's no MRV published.
Fuchs Titan Sintofluid 75W-80 is a full synthetic GL-5 MTF designed for lifetime fill applications for euro cars like VW and BMW. It's got a much better pour point at -48°C, and MRV is low at 37,000 cP at -40°C. It seems to contain good amount of PAO.
Has anybody used either of these in a Subaru or other vehicle? Any opinions on GL-4/GL-5 vs GL-5? I'm leaning towards the Fuchs, since it's full synthetic and is almost the same price.
Motylgear data sheet
Fuchs data sheet
The Subaru Extra MT is only sold in 5-gallon pails and it's not cheap, so I'm looking for something else. It seems there are only two other options:
Motul Motylgear 75W-80 is a semi-synthetic GL-4/GL-5 MTF. I've heard mixed opinions about whether dual rated GL-4/GL-5 gear oils are as good as dedicated GL-5 for a transmission. I'm also not sold on its cold weather performance. The pour point is only -36°C, and there's no MRV published.
Fuchs Titan Sintofluid 75W-80 is a full synthetic GL-5 MTF designed for lifetime fill applications for euro cars like VW and BMW. It's got a much better pour point at -48°C, and MRV is low at 37,000 cP at -40°C. It seems to contain good amount of PAO.
Has anybody used either of these in a Subaru or other vehicle? Any opinions on GL-4/GL-5 vs GL-5? I'm leaning towards the Fuchs, since it's full synthetic and is almost the same price.
Motylgear data sheet
Fuchs data sheet