I want to change the lube oil in my 90 90 5-speed manual. What is better?... Valvoline 75W-90 Synthetic ($10.95/qt. at my local NAPA) or Red Line 75W-90 Synthetic ($8.00/qt. mail order from Imparts)? Or are they about the same? Thanks in advance, Tony Fordham Grand Haven, MI 90 90