Even if a change in oil fixes, bear in mind it's only temporary. Slipping only means the current GB has gone beyond it's limit. Could be due to age/wear.Oil just changed last 6000 km's ago with fresh filter. Using Addinol ATF cause that's the brand that my buddy mechanic is carrying. It drives OK before remapped, WOT before that won't slip or anything. Probably the ATF is too thin or anything ... might try to use original Toyota ATF meant for A340e and try it again.
Dont WOT anymore. Slipping is a sign of an impending bad event.
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