Join Date: Nov 2005
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I'm running Amsoil 15-40 Diesel oil with a bypass filter. I changed the oil last time at 17K because it just looked too black! The oil analysis came back OK, I just felt that with towing the travel trailer and all that I would change it. I ran Royal Purple before the amsoil and got 20 K out of it before changing. It also had the bypass filter setup.
I think any good oil can be ran further than what is recommended as long as you do an analysis to be sure. The recommended changes are what the manufacturer feels covers the range for different users. The last time I replaced the Amsoil it only had about 3000 miles on it but that was when the head gasket started leaking and the analysis I had done showed a trace of water. That trace was enough for me to drain it and put conventional oil back in until the head work was done. Ran conventional after the head and cam were installed for about 1000 miles and then went back to Amsoil. Will do another analysis at about 7500 miles to make sure all is well with the new components.
NOTE- I am not recommending any oil in particular, just stating my experience. Each person will have his own preference so lets make sure we don't start an oil war here like what got going over on TDR in the past.
93 D250, PDR Twins HX35&HT3B, 60+# boost,PDR stage 2 head w/o-rings, PDR Cam, modified VE Pump, piston style lift pump, modified 5" intake w/AFE, ATS ported manifold,DTT 89% converter, 4" RIP exhaust, modified tranny, EGT/boost/tranny/tach gauges, TPS removed, a little chrome under the hood. Mag-Hitec tranny and diff. covers. Rear sway bar. Line-x bed liner, after market seats. Single stage Water/Meth system installed. Oversized intercooler w/3" IC lines.
05 Chevy 2500 HDcrew cab 4x4, Duramax W/Allison, 17" Hummer wheels w/285-70-17 BFG's, Banks intake, ported turbo mouthpiece. Predator programmer, Autometer EGT and boost gauges.