From what i've read Opti-Lube is supposed to be the best for lubrication, i have never tried it though. I have used Lucas and Power service, with no problems.
I use to use Power Service Silver bottle, til B5 diesel and I 'll tell ya if you can find any B5 thats the best way, no loss in power about 10 times quieter and it cost the same as ULSD.
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