Royal purple syncromax . that's what I used when I change mine about month ago. My 2nd gear grind is gone yayayy
I am loving Royal purple syncromax . I even change my rearend with Royal purple 75w 140
I just did the same this weekend past... went with Mobil 1, cuz there wasn't any RP around here. So far so good. I definitely notice the difference from the stock stuff. The only thing I would hafta warn, the darn drain plug is towards the rear of the car, I had the front jacked up quite a bit on jack stands and it was still tricky to get at lol.
I went with 3L (3.2Qts?)... darn americans lol... adopt the metric system already!