[shoooo32]

Apples and oranges, Thomas. The video is referring to engine oils and makes a few valid points. However, our 911 gearboxes have more in common with a v-twin Harley than they do a new 911.

Bel Ray's GL5 rated hypoid gear oil (85w140) has stood up to the extreme conditions we've put it though with no adverse affects to the internals. Sure it takes a minute to warm up and will shift a little clunky until then, but you're waiting for the engine oil to warm before attacking the far side of the tachometer anyway. Once everything is up to temp you can beat it like a rented mule knowing your gearbox is protected.

Also, these aren't lifetime fill or even a G50 with longer fluid intervals. I recommend changing it at least every 15k miles. Bel Ray is inexpensive - I swap it out after every rally (typically 5k miles). Total cost for bearings for a 915 are well over $1k now, what's an extra $40 for gear oil. I don't have skin in the game - I build 915s for fun to support fellow rally dorks. Y'all do whatever you want. I'm just sharing my experiences.