Is 20w 50 to thick a oil for my 2001 GMC Sierra 1500 4.8 vortex with 225.000 miles

[MARA]

Is 20 W 50 oil to thick for my 2001 GMC Sierra 1500 4.8 vortex with 225.000 miles on it

 

[oldhp]

Making funny noises? Knocking? Burning oil? Then no. Running fine, then yes.

 

[John_Conrad]

as mentioned above, you don't likely need 20w50. your owners manual should say do not use 20w50 and recommends 10w30 as the thickest and that is likely what i would use this summer.

 

[benjy]

where do you live? + info about the engine condition. i ran 20-50 in the summers in Pa in an oil burner BUT could NOT crank to start when it got cold!!!

 

[Rygrego]

Not an issue in warmer weather above 32.

 

[Rat407]

It will not hurt a thing.

 

[Malo83]

I'll run 20w50 in my old 305 in the summer months with triple digit heat.

 

[JC1]

What about using 10w-40?

 

[SwampSurvivor]

I dumped 20w-50 into an old Jeep 4.0 that had some serious leaks. All that did was make it super noisey ... moreso than a jeep 4.0 normally is!

 

[John_Conrad]

??