1990 f350 did not have a turbo, unless it was fitted after market, so check what engine you have such as year and size and then maybe we can answer your question
how do i down load a wiring diagram for a f350 6.0 diesel engine compartment
4 million pounds
yes all powerstroke engines are turbo
blow by through the turbo ,my truck did the same thing had to get the turbo rebuilt
mercon sp
my 93 f350 turbo diesel was 190 hp stock , but by putting a banks sidewinder turbo , cold air intake , k&n air filter , and straight piping it , it is well over 300 hp , howeaver my dads 2005 f350 is stock 325 hp
clogged or damaged catalytic converter
A fuel filter
it can be unburned fuel damaged turbo charger etc. light amount of smoke can be normal large amounts = problem.
How do you change the alternator on a 1996 ford F350 diesel
where does the oil pressure regulator on a ford f350 diesel truck
According to the AutoZone website : For a 1995 Ford F-350 , 7.3 liter turbo diesel engine : With engine oil filter change : ( 13.9 U.S. quarts )