my 1993 honda del sol had a redular d15y8 transmission on it and made a whurring noise when the clutch was disengaged. To solve this problem i bought a civic -si transmission that goes to a del sol-si. I used pennzoil 10w30 in it when i did the swap. About 2 months later i canged it to royal purple 10w30 and it made the whurring noise again but not as loud. Can you tell me what the problem may be
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