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I never said anything about 3/8. OEM for your year if it has the original motor is 3/8 npt on the block and 1/2" lines that use 3/4-16 Tub-O fittings in the cooler. Aftermarket cooler we sell is 1/2" npt with 5/8 lines and fittings for which ever block you have. Greg

The fittings for that cooler are 3/4-16 Tub-O fittings. If you need one right away I think a junk is going to be your best bet. You won't find a cooler off the self. http://www.lubricationspecialist.com/gm-6.5td/6.6l-diesel/ Greg

Cut and pull them out then replace with these. http://www.lubricationspecialist.com/gm-6.5td/6.6l-diesel/96-and-earlier-6.5td-oil-cooler-lines/ Greg

This is a supplement. Nothing wrong with the OEM other than it needs a bit more filtering.

For those that have been waiting patiently we now have the Duramax Universal Fuel Filter Kit back in stock. http://www.lubricationspecialist.com/gm-6.5td/6.6l-diesel/duramax-universal-fuel-filter/ Greg

For those that have been waiting patiently we now have the Duramax Universal Fuel Filter Kit back in stock. http://www.lubricationspecialist.com/gm-6.5td/6.6l-diesel/duramax-universal-fuel-filter/ Greg

We have what ever you need to get you up and going. Can do lines only or cooler and lines. What it takes we have them. Everything is in stock and ships same day. Can ship any method you wish. http://www.lubricationspecialist.com/gm-6.5td/6.6l-diesel/96-and-ealier-6.5td-oil-cooler-lines/...

Updated pricing on your 97 and newer engine oil cooler lline kit. Now $149.95, kit includes o-rings for the filter adapter. http://www.lubricationspecialist.com/gm-6.5td/6.6l-diesel/97-and-later-6.5td-oil-cooler-lines/ Greg

kennedydiesel.com John was the one that originaly brought it to market some years ago. They are american made too. Greg

When using dope be sure to let it set over night. Tape will desolve over time and leak too. Permatex makes a good pipe dope. Its blue and sets up hard as a rock. Only issue is if you ever need to remove the fitting. Greg

Yes we can do that. But it will cost for whatever the extras are. Greg

New 5/8 oil cooler line kit. http://www.thetruckstop.us/forum/showthread.php?36627-Oil-Cooler-Lines-Only-Kit-For-1997-and-Newer-GM-6-5TD

We now have a lines only kit for all 1998 and most 97 GM 6.5TD. If you have and earlier truck or van with the smaller 1/2" lines you need our OCLK95 kit. Kit is complete with cooler adapters, lines and block fittings. Hoses are stainless steel braided Teflon lined. 1998 and new a most...

Not with a 6.5TD loaded. I've seen 275° easy on mine loaded. The 6.5 is a good candidate for synthetic oil. Greg

New kit for those that want to replace oil cooler lines only. You know longer have only one supplier for such a kit. This kit is for the older models. New model kit will be available in a week or so...

Its not so much if it can pull the load, but how about stopping it? 26K with the brakes of that time is a lot and if you get in a wreck and they find out your overloaded they my not pay. Greg

After a few months of not being available, we once are ready to ship the Universal Fuel FIlter kits. http://www.lubricationspecialist.com/gm-6.5td/6.6l-diesel/duramax-universal-fuel-filter/ Greg

For those that are not aware we have upgraded our kit about a month or two again. Instead of 45 degree fittings going on the cooler, the kit now has swivel fittings. You can see it at the link below. http://www.lubricationspecialist.com/gm-6.5td/6.6l-diesel/gm-6.5td-oil-cooler/lines/ Greg

After a long hunt we have found 45* degree swivel fittings for the -10 lines. Not a problem getting them for the -8. Any why this will greatly aid in simplifying the installation. You will no long after try and get the old 45's in just the right spot. Only bad thing is we had to raise the...

These pumps are reverse polarity protected. So if you hook it up backward nothing will happen. Greg