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After reading the discussion leaning towards the idea that 5w shears more and maybe the ol 4l was pre increased cafe standards. I'm actually running 5w40 in my 4L. My oil pressure seems to drop on the lower side when the oil is hot and motor is worked. Either from a lazy oil pump or clearances...

Looking at my 2001 jeep GC owners manual I'm wondering about this viscosity chart. Why would the 5w30 not cover the same hot side as the 10w30 for the 4L but not the 4.7L? Just don't make sense to me. Maybe I'm missing something, can you guys help me out with this?

Thanks for all the suggestions. My friends were saying I'm crazy to deviate from the recommended 5w30. I guess cold is relative but it usually gets gal. I usually tow in the warmer months about 6k lbs hopefully on a biweekly basis this year. Gas mileage is pathetic so I doubt it will make a...

Hi guys, New here and wanted to talk about oil viscosity and apply it to my 2001 yukon 2500 8.1L engine. as you know GM recommends 5w30 for about all their v8 engines around this time. The reason for this discussion is b/c this motor is also used in marine applications and has a different oil...