hitman no doubt your correct, the cummins engines used the HX-35 forever and they are a 5.9L inline 6...they have large intercoolers too after 92 or something.....perhaps our merc heads dont flow for beans either..

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1992 300TE 4matic - Just obtained 12/22/06
1983 300D - SOLD
1997 Dodge 2500 - CTD 400+HP, 1100ft/lbs torque