As the title suggests. It happens very rarely, usually when I am gunning it from a slow roll to make that left turn before the light turns red lol but it doesn't slip every time. If I am going straight I can gun it all I want and it won't slip. The car is 15 years old with over 200000 kms/124000 miles. I did 3 drain-and-fills of the trans fluid in the past 3 three years with OEM fluid and the fluid looks fine to me. So my question is whether this is something normal in a 15 year old transmission?
Well, you may be overdoing it with the drain-and-fills, unless you're racking up 30K miles a year, or so. With older transmissions, there's a balance between keeping the additives fresh and not removing too much of the grit that provides necessary friction for older clutch plates. If you're draining-and-filling every year, at 20K miles or less, you're doing it too often. You're draining out too much of the grit that keeps the eroded clutch plates working.
I'd keep using the vehicle, but back off the drain-and-fills to once every three years or 30K. Others may have a different view on the change interval, but the main point is to keep enough grit in the system to provide the clutch plates with necessary friction.
Is this an automatic transmission?
Is it slipping during shifts, or any time?
You can try some Lucas Transmission fix, but the tranny is probably worn out.
