80W90 gear oil will work fine for the non-clutch diffs/LSDs. If you are running in colder or hotter weather conditions, then a wider-range blend like 85W140 may be a better choice so your oil doesn't sludge up in winter or get too thin during the summer. I'd go for the most expensive stuff you can buy if it comes with a sticker you can slap on your Sporty... Wear it like a badge of honor! <img src="/forums/images/graemlins/notooth.gif" alt="" /> Just kidding - any brand of oil should be fine for regular use. If you're pushing the limits, then one of them "yuppie oils" might be worth a try... <img src="/forums/images/graemlins/patriot.gif" alt="" />