curtis73

Correct. I got the fluid for the 722.6xx. I don't have any bottles in front of me, but it was straight from the MB parts counter.

jamieh

I must also agreed that my car a (1997) E300TD with the 722.6 Tranny also doesn't seem to lockup at any stage in any conditions. It has been this way since new.

From reviewing the treads above, once your over 80 MPH the converter should be locked, yes ?
If so driving on the flat at +80 MPH and letting of the throttle shouldn't cause the rev counter to drops several hundred RPM's, which mine does.

This doesn't bother or concern me but I can’t see how the chart above relates to my car.

Also on a side note I felt the pervious tread in which Derrel was berated by several members was disgraceful.

However I do appreciate this site and have received some great advise and cost savings.

I've also seen in other posts people being berated for spelling and grammar, as a dyslexic this really bothered me and I can’t see the relevance on a forum should as this.

Green E-300 DT

Yes indeed. If any automatic transmission having a locking torque convertor
is going to engage, it should be programmed to do so long before 80 mph.

With almost all the many cars that I have owned over the last thirty years,
I have found that most do in fact lock up their T/Cs (if so equipped)
at speeds as low as 38 mph and always before 50 mph.
If the vehicles does not lock up by those speeds, what is the purpose
for the vehicle having to go faster before T/C engagement?
The car I am now driving will engage the T/C at only 38 mph when in fifth
gear, and will stay locked up down to 1000 rpms or approximately
30 mph even when slight acceleration is called for.
When the T/C is not engaged, one is merely heating the transmission fluid and therefore
wasting energy and this will and does lower your fuel economy plus needlessly
cause the transmission to run hotter than it would otherwise.
I think that may have been the cause of my last '99 E-300 DT's transmission failing.
That car had only 127K miles, and the tranny had had at 100K miles a complete
tear down and inspection which included new fluid and a new filter.

Why would MBZ program any diesel to wait until 80 mph to engage a locking T/C?

I think that chart shown may apply to some other cars, but it
surely does not apply to any diesels I have had or driven.

Thanks again.

Derrel