[vajper]

This winter I have experienced some RPM fluctuations that I for some reason have associated with the gearbox. What I experience is that the motor RPM is moving between 1400-1600 rpm when driving on gear 3 and 4. It may be present on gear 5 too. This happens both when using cruise control and having my foot on the throttle.

The phenomena seems only to present after start, after driving for 15 minutes or so it seems to be gone. I have no fault codes that seems to be related to this (even though occasionally get an EGR fault code on one of the valves).

The gearbox is JEF, it has 280kkm on it and I'm pretty sure the transmission fluid never have been changed. I'm now considering my options. Can low fluid level result in these fluctuations?

If level indeed is low (plan to check that), should I consider changing the fluid? Not that keen on a full flush and not sure if it is worth it on this old car. OTOH I plan to keep it for a few more years.