Which synthetic oil?
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I'm using Royal Purple. DaveE, Pennzoil Platinum is what I'm running in the wife's Grand Cherokee. I was kinda surprised the owners manual called for Pennzoil in the Jeep.
If you’re a preferred dealer you get wholesale, 35% off. If you get the gallon jugs ($34 *.75 = $25.50). Yes, it more, but them you’re actually getting a true synthetic and better protection and longer change cycles. You might even get better fuel consumption. My way of thinking about this is not to spend more but to spend smarter.
Not going to explain it fully since a quick search will get you the info
Group IV has much broader temperature range and are great for use in extreme cold conditions and high heat applications.
Video
http://bestsyntheticoilguide.com/best-synthetic-oil/
This is a good read but I would make note that the top five list is misleading as Royal Purple has changed their formula and is not a group IV anymore, and only the European blends of Mobil1 are also Group IV so be careful where it's made as the north America ones are dino blended.
Group IV has much broader temperature range and are great for use in extreme cold conditions and high heat applications.
Video
http://bestsyntheticoilguide.com/best-synthetic-oil/
This is a good read but I would make note that the top five list is misleading as Royal Purple has changed their formula and is not a group IV anymore, and only the European blends of Mobil1 are also Group IV so be careful where it's made as the north America ones are dino blended.
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I had to pull teeth to get my stupid dealer too give me free oil changes.. but 9in going full synthetic always
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The oil he's using in that test is Pennzoil Ultra Platinum, which is (as you have said) a Class III oil. Nothing wrong with a Class III, and for the cost I'll certainly go with it over a Class IV for a daily driver... I'm not racing this car on the track every weekend.
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