I want to change the e-transmission oil in my 2017 BMW i3 Rex. It's a single-speed transmission/differential combo. The factory oil is BMW G1 Hypoid oil 75W-85, part # 83222295532. This is apparently a GL-4 oil.
The BMW fluid is insanely expensive and I have an extra liter of Motul Gear 300 75W-90 in my garage that I'd love to be able to use. This is listed as a fully synthetic hypoid GL-4/GL-5 compatible oil, so I don't get why it's not listed as an oil for my car, other than its 75W-90 and not 75W-85. Some sites list Motul MotylGear 75W-85 as being a G1 fluid compatible with part # 83222295532. It's my understanding that Gear 300 is superior to MotylGear, so I feel like this Gear 300 should be fine. I'm pretty sure there would only be a negligible difference in fuel economy and it may offer better protection.
Any advice from knowledgeable gear oil folks would be greatly appreciated. Would there be a risk in using the Gear 300?
Sample transmission (not mine). Note the broken teeth!
The BMW fluid is insanely expensive and I have an extra liter of Motul Gear 300 75W-90 in my garage that I'd love to be able to use. This is listed as a fully synthetic hypoid GL-4/GL-5 compatible oil, so I don't get why it's not listed as an oil for my car, other than its 75W-90 and not 75W-85. Some sites list Motul MotylGear 75W-85 as being a G1 fluid compatible with part # 83222295532. It's my understanding that Gear 300 is superior to MotylGear, so I feel like this Gear 300 should be fine. I'm pretty sure there would only be a negligible difference in fuel economy and it may offer better protection.
Any advice from knowledgeable gear oil folks would be greatly appreciated. Would there be a risk in using the Gear 300?
Sample transmission (not mine). Note the broken teeth!
