915and G50 lubes

Seems like many of the remarks here are in relation to 915 gearboxes needing oil changes, more often than typically attended to, to alleviate some of the "synchro-allignment" and premature wear symptoms. What time sequence is recommended for the G50 box lube change, and is Swepco still the best lubricant?
Thanks,
Michael

The 915 is NOT a special case, ALL of the Porsche design-ed transaxles, back to the 356, use the same design synchronizers, a Porsche-patented design used in some Ferrari (the Dino was one model) road cars as well! The problems seen here, in most cases, are related to many years of neglect with respect to changing the gear oil! A car with no shifting problems and a history of changing the gear oil yearly does not need a rigorous gear oil change schedule, and any high-quality GL-5 gear oil will probably suffice. In the '50s and '60s most Porsche owners did a lot, or all of the work on their cars. That seems to have changed in the '70s, and neglect seems to have been commonplace! Most US garages and mechanics don't think about changing gear oil on ANY schedule, just when work is done on the offending component! When I bought my car, it was a bit 'graunchy' on the 1-2 shift, but that went away after two oil changes, and I have had no problems in the last 22 years! Most of that time, I used Castrol Hypoy gear oil at $1.95-$2.49 per quart, but when I heard about SWEPCO 201 from Bruce Anderson in his newsletter at Garretson Enterprises in the mid-'80s, I switched and have stayed with it, and recommend it to anyone wanting to do their own work, or have a car last a lifetime! The price of an oil change at a garage or dealership makes the SWEPCO essentially free, or low-cost, if you do the change yourself. I have found yearly gear oil changes to be adequate, regardless of the lubricant used, assuming all of the old oil and contaminants have been flushed out, and the transaxle is without symptoms or problems.

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Warren Hall
1973 911S Targa