2001 volvo s40 transmission fluid. Change?

Tranny still slipping when hot on first even after just putting Lucas in it. When driving in cool weather, I have no problems. What I do now is go to manual and start off in second. Problem solved for now

Amazingly it has stopped slipping and has been running very well. Just the other day after running for almost 3 weeks, I got the fluid drained because it was downshifting hard and refilled with Mobile synthetic and a full bottle of Lucas. Doing that solved that problem and also the slipping didnā€™t come back. The mechanic found the normal amount of shavings for the age of the car. Lucas might have saved the tranny but only time will tell.

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