Question about 2001 Jeep Grand Cherokee
Unless you live in an extremely cold climate (sub or close to sub zero) I'd recommend using at least a 10w 40 oil. The first number indicates how well the oil pours (flows) at freezing, the second is how well it protects at operating temperature. Your other option is to use a 10W 40 synthetic which actually flows and protects far beyond the #'s on the container on both ends of the scale. One reason some manufacturers have specified a lower first number is because they feel that will keep the piston rings free.
In reality, any good oil will do that (non-paraffin base) and any of the synthetics will do it better. I live in an area where we get both very cold weather and also some very hot weather. I use a 20w 50 synthetic and have never had an oil related problem (my engines regularly go over 350K and vehicles are replaced for other non engine related reasons such as body rust)
Posted on Feb 08, 2010
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Posted on Jan 02, 2017
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