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Originally Posted by SHERIFFJP
I'm also doing my first oil change and I going to go with full synthetic but my dad wants me to put in 20w50 not what the manual says. I dont know if that will mess up the engine
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No , use what GM says to use 5W30 . I once did that with a vehicle before that called for 10W30 but used 20W50 instead and ended up with early oil pump failure( maybe because of the thicker oil used ? ) . Also the newer engines have tighter tolerances and require the lighter weight oils .