I don't know a lot about trucks but hoping you guys can help. I have a 1993 6.5 turbo. It's a standard. it blows a lot of black smoke and seems very low geared. the problem is that I bought a gooseneck living quarters, 3 horse horse trailer. the trailer when empty is about 5,900lb and loaded probably around 10,000. Do they make chips/tuners for that old of a pickup? it just hit 130,000 miles. its all stock. thank you
P.S also someone told me to add a cheap oil to the diesel when I fill up to improve mileage, will this damage my engine? thank you again:)

Welcome to the site, Gadget!

The usual: Check the FAQs at the top of this page, read other posts, etc. Also it is a good idea to put your truck info in your signature. You have a mechanically injected truck, which means few electronic options for "souping it up". The experienced mechanics here can advise you about the black smoke.

How long have you had your truck? I have a similar truck, bought 2 years ago, that I sometimes tow with. My equipment trailer, tractor & implements are around 10,000 lb fully loaded. My 6.5 truck works hard pulling this load. My recommendations for durability and a little more power:
- Make sure you have good cooling! Overheating kills. I upgraded to the 1997 on heavy duty water pump / dual thermostat / heavy duty fan set up. At least make sure the radiator is in good shape. I replaced the radiator soon after I bought the truck.
- Exhaust temperature and pressure gages, so you can monitor exhaust gasses to prevent frying the turbo. I still need to get these.
- Low restriction exhaust, including connecting pipe from the engine, for better breathing.
- Other basics: Use good fresh fuel (NO motor oil added) and make sure trans, differential & transfer case have good lube oil; synthetics are best.
- As part of checking out the black smoke condition and before towing, you might get your fuel injectors & injection pump tested.
- Read the Towing and Trailering thread & posts here, particularly if you are new to towing.

Later!