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Roush PSD Interceptor · 03-26-2012, 01:17 PM

Rotella 15w40 + 2 quarts Lucas Synthetic Stabilizer, Motocraft FL 1995 and one 12oz bottle of Prolong in the HPOP.
I ran full synthetic last change and will switch back this change.
I always gauge the condition of the dipstick as an indicator of the deposits left behind by inferior oils.
If I can't see the cross hatches on the dipstick thru the oil then it is dirty enough for a change.

My uncle is the shop steward/foreman for Cummins Crosspoint LLC, Cross Lanes, WV.
For 40 years he has worked there.

He says they used Valvoline with the ultraviolet dye marker for break-in oil on the larger engines like the QSK70
at that rebuild shop.
IDK maybe they switched to Delo 400 since he told me that.

03-26-2012, 01:17 PM	#6
Roush PSD Interceptor Member Join Date: Mar 2012 Location: Ringgold, GA Age: 58 Posts: 73 Rep Power: 13	Rotella 15w40 + 2 quarts Lucas Synthetic Stabilizer, Motocraft FL 1995 and one 12oz bottle of Prolong in the HPOP. I ran full synthetic last change and will switch back this change. I always gauge the condition of the dipstick as an indicator of the deposits left behind by inferior oils. If I can't see the cross hatches on the dipstick thru the oil then it is dirty enough for a change. My uncle is the shop steward/foreman for Cummins Crosspoint LLC, Cross Lanes, WV. For 40 years he has worked there. He says they used Valvoline with the ultraviolet dye marker for break-in oil on the larger engines like the QSK70 at that rebuild shop. IDK maybe they switched to Delo 400 since he told me that. __________________ 2000 F250 Lariat CC 4x4 PowerStroke 7.3 T444E Last edited by Roush PSD Interceptor; 03-26-2012 at 01:18 PM.