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The following results are from the factory-filled 75w140 in rear differential of my recently purchased '99 F350. This truck has the Sterling 10.5" rear axle with a traction-lok carrier. Analysis by Schaeffer's. Copper-2 Iron-1315 Chromium-2 Aluminum-2 Lead-0 Moly-5 Phos-2015 Zinc-187...

I recently picked up a '99 F350 for a plow truck and have been changing the drivetrain fluids. This past weekend I did the rear differential, which is the Sterling 10.5" with 3.73 gears and a traction-lock. Ford says the 75w140 does not need to be changed unless the axle is submerged in...

A friend of mine owns this vehicle, a 1994 Chevy Lumina Van, 3.8 LTR V6. 258,614 miles currently, the engine had rod bearings replaced years ago due to a massive coolant problem (intake gasket failed). I believe he has used the 20w50 since the bearings got wiped out, to maintain proper oil...

This vehicle belongs to a customer of mine, it is a 2002 Impala with well over 200k on it. This engine was sourced from a local junkyard, and installed last year. The engine had ~50k on it when it was installed, this oil was installed immediately after the engine swap. No make up oil was...

Texas Refinery Corp. Pro-Spec III 15w40 CI4+. The N14 puts out roughly 500hp and is installed in a John Deere self propelled chopper. This unit runs wide open most of the time at maximum load. Sump capacity is 42 quarts, 3 quarts of make up oil added. Analysis by Wearcheck, values of zero were...

Third UOA for the Navigator, my main objective is to monitor the engine after some major repairs. One cylinder head was replaced early in its life and all timing chain tensioners/guides were replaced at 42,700 miles. Motorcraft filters were used for all OCI's. From left to right the oil in use...

The equipment is a John Deere 4650 tractor with the 466cid engine. The unit is almost 25 yrs old, approximately 7000 hours on the engine since last overhauled. The tractor was used daily all winter, it gets started every day in an unheated building with temperatures as low as -20F. Prior to...

A wix filter was used for this OCI, which was about 12 months. The car is mostly used for a 17 mile commute, although it does see plenty WOT bursts. I'm not sure what to make of the bearing wear, but the oil seemed to hold up well.