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1989 Volvo 744T Out: Factory fill (Probably) 80w-90 In: Valvoline Synpower 75w90 The magnet probably had a 1/4" of fine filings on it. The old fluid also smelled absolutely disgusting, I had to get a fan under the car so I could breathe without getting sick. Washed out the diff with brake...

Thanks guys, I'll stay with the Rotella.

I'm about 4k into a fill of T6 on my Volvo, and I'm thinking of switching to another 5w-40 for no particular reason. I originally decided on T6 after reading these forum a lot. That being said, here are my answers to the questions. 1. '89 Volvo 740 turbo 2. The manual says SF (ha) 5w-30 up to...