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I tried the Amsoil flush first but it wasn't quite stout enough for a quarter million miles in a neglected diesel ( I sell Amsoil , but the flush is for normal engines and moderate cleaning)What I finally found that works is Ol Schlamm Spulung, made by Liqui-Moly ( you put it in and drive lightly for about 300 km then change it, Instructions on can are in German only). Mine was burning a qt every 30 miles when I got it , .first flush got it to 160 miles a qt. after a few more flushes an a breather trap I'm going over 800 miles on a qt and running better every day.( using a qt every 1000 mi on these engines is not out of line for new )
The compression increased so much during thefirst flush with this stuff that the old starter would no longer turn the engine fast enough to start and I had to replace it.
I'm running the Amsoil 15-40 diesel & Marine oil now. I have not installed a bypass filter yet. the oil is continually cleaning and I think I would probably be changing bypass filters every three weeks right now , so I'm just running a lower change interval( about 7000 mi, I know , the owners manual on these things said 7500 mi on regular oil...Thats why they all have stuck rings .1500 mi max on regular oil. The folks at Amsoil recomend 7000-10000 on Synthetic for this engine) and flushing before each change.
It runs great and gets 36-38 mpghighway or in town( rural area I can idle around town all day
in OD)
I love this little thing , If I ever have some spare cash to blow , I'm going to try to find a decent 740 turbo diesel wagon with an automatic for my wife , to save a few bucks on commuting and some wear on her '90 240 wagon.
I don't know if I'd like one of those new VW tdi engines , too much electronics.
With these old things , the whole car could short out and all you'd have to do is run a jump wire to the fuel solinoid , jump the starter, and you're rolling.
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