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2017 Pro-4X w/Luxury Package
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1,086 Posts
I could be wrong (don't have the manual with me) but don't the 1st-Gens require a very specific gear oil? Something about newer oils damaging bearings?
 

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Most of the GL5's can be used, in 1st gens, with everything I have read. I m partial to Valvoline High Mileage (that is a 4 or 5, with LSD add.) I know I wouldn't use 6, I have read that it's bad. That being said, keep doing your research! And, yes, Im ready for the LSD jokes. LOL
 

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If you use GL-5, just make sure it states that it is "safe for yellow metals."
 
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