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Don't use low ash oil in a 6.5L.
Low ash = low detergent.
You only need low ash if you have one of those fancy new diesels with a catalytic converter or if you run a high compression gasoline engine and have problems with preignition.
If you have the soot trap on that 99 remove it. Its likely plugged up with soot. Very few if any of them are still functional.
A good free flowing cold air intake and exhaust with a responsible tune will keep the soot down to near non existent levels.
The free flowing exhaust will allow the turbo to force feed more air into the engine burning all the nasty soot. The soot trap a lot of times causes more soot to be produced than it can ever clean up.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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