Been using Kwik Kar, but schedules no longer jive.

Truck is at 173,000 and counting. This interval was 4,000. KK was using 10-40 at my request, usually castrol with a pennz filter.

Grabbed a napa gold filter and a 5 quart jug of pennz 10-40.

Oil pan was a 5/8, knocked it out and got the old oil out, then put back in.

Move the drain pan to under the RF control arm, I had a small filter so I used the small filter wrench and got that out of the way to drain.

Went to put the new filter on. It's a big body, but it clears the control arm pivot...barely. Wrench was a bear to get it tight with the oil pan there.

Dumped in 4 quarts, unplugged the ignition coil, put the oil cap on, and spun it over until the oil pressure gauge registered, could definitely hear the rockers clacking until they got wet. Checked the oil level, added a half quart or so, put the cap on and hooked the coil back up.

Needle immediately went to the 3/4 mark with the cold oil. Normally a cold start was lucky to get halfway. /not sure if filter is that less resistive or the new oil makes that huge of a difference.

Cut the filter open, didn't really find anything other than dirty oil. Very surprised. Looks like motor is in good shape and air filter is doing it's job.

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Nasty looking filter...lol

 

I'm thinking the bypass valve might have opened, based on the oil pressure behaviors and how plugged it looks.

 

No way would it have opened on a 4K interval. They all look nasty when you open em.