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Good catch! Typo on the report, the oil used was 5W.

Good info, thanks! I tow a 32' RV that weighs about 8500 lbs with this truck. This oil sample only has a few hundred towing miles on it. The truck has used 1 qt every 3k miles like clockwork since it was brand new. I always stuck to a 3k OCI so I never had to add any...now I have to add...

Originally Posted By: Chris142 The iron is higher than I would like to see. I personally would try a Dino oil,a 10w30 then a 10w40 to see if the iron comes down. The iron is lower now with the M1 that it was on the last UOA with dino oil....how will going back to dino lower the iron more...

Originally Posted By: ZeeOSix I see zero difference in oil pressure using many different oil filter brands/models. That's been my experience too, so thought it was odd that oil pressure would be low and then have it go back to normal after a filter change. I posted the Blackstone report here...

Here is the report: I could use some help interpreting the results...in the previous sample the oil was Valvoline 5W30 conventional non-synthetic. This report was Mobil 1 Hi-Mileage. What catches my eye is that calcium is way down, while Magnesium, Molybdenum, and zinc are up...are these...

GM recommends their rear axle fluid, 75W-90 synthetic, P/N 12378261 that comes with the proper additives in it already. Other have reported using other brands with separate additives and getting chatter from the rear. I change mine every other year. The only downside to the GM lube is that it's...

Got is, so zee-0-six meant to say "constant displacement" instead of "positive dislpacement", makes sense now. Good points, and there are actually two bypass valves, one at the pump to prevent over-pressurizing, and one at the filter to allow circulation to continue around a blocked filter. Oil...

Originally Posted By: ZeeOSix Questions: 1) What kind of vehicle is this? 2) Does it have a positive displacement oil pump? 3) What kind of oil pressure gauge is in the car (factory or aftermarket, digital or analog)? 4) Did you use the same Mobil-1 5W30 Hi-Mileage oil in both cases? 5) How do...

So that was my question....is there, or could there be, any correlation between the filter and the oil pressure drop of 10 psi? Does that make the Fram TG a better or worse filter than the Delco, or is the psi drop along inconclusive? I've never had any way to quantitatively compare filters...

Last oil change I installed a Fram Ultra Guard since the Wal-Mart by me stopped carrying AC Delco filters. Local auto parts stores don't seem to carry the AC Delco filters either. Right after that I ordered some OEM PF-454 filters from Rock Auto so now I have a few on hand. On a road trip to...