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94 zj with a six. 277,000 miles on it. It fuckin purrs when I change oil. Wix filters and T5 rotella 15/40, Its great being a boomer.

94 zj with a six. 277,000 miles on it. It fuckin purrs when I change oil. Wix filters and T5 rotella 15/40, Its great being a boomer.

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[–] • 1 pt

No, I dont. If anything I change it to soon.

[–] • 2 pts

Then it would have acted the same before and after the oil change. The difference you stated is a difference in oil health. Pennzoil use to go out grade by 1000 miles, longer and you were doing damage and generating carbon deposits in the engine.

[–] • 1 pt

I have always noticed when I change oil in anything, maybe you just dont pay any attention or have very low mileage motors. Rotella is a robust oil.

[–] • 2 pts

You can notice all you want, fact is oil degrades and the additive pack depletes and the viscosity improvers aren’t terribly shear stable. They wear out.

You can get good data from one of these http://www.lab-mills.com/lubrication-oil-wear-test-machine/oil-wear-test.html or send your oil out for analysis for 20-$30. The wear analysis not only tells you the state of the oil, but can also tell you exactly what part of your engine is wearing out do the presence of specific metals in the oil.

You can run amsoil and go up to 100k miles on some of it with secondary filtration, change the oil and it won’t feel any different.