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Probably a dumb question about motor oil

Posted 10-11-2021 at 05:40 PM by Blondebaerde

Originally Posted by Colorado Rambler View Post
I have an old Jeep (2005) which is in need of an oil change. Before I always took it to Wally World and told them I wanted Pennzoil 10-30 and then wandered off to do my shopping. Never had a problem.

But now I have a very opinionated roommate who just gave me a coupon for Jiffylube and told me that I should use them to get an oil change with "high mileage" oil or even "full synthetic" oil. Both these options are not especially cheap. I'm on a tight budget which is why I always used Walmart in the past.

Can anyone explain to me what "high mileage" and "fully synthetic" oil actually are? Is this just some Jiffylube thing to entice customers? If not, why would one of these expensive oils be better for my jeep then good old Pennzoil 10-30?

Thanks to anyone who can enlighten this dumb broad!
Best as a blog post:

It's a troll-ish conversation unfortunately, thought that was probably not the intent. "What oil to use" (in a nutshell) has no rational answer.

I've taken to having my used engine oil analyzed by a lab periodically, at time of change, so that *for my use case* I have a good idea what type to use AND the interval. Never mind what, or why, as that's pointless information. BB is not OP.

Probably too much work for most to do. I don't trust "Jiffy Lube" to do much right, they don't have a shining history of tip-top service. That said, had a lot of my Tacoma service done there for years and that truck was fine and dandy when sold at 120K! Don't think they harmed much but I question their attention to detail. My opinion: they're doing fancy footwork upsell in this case.

I simply have a trusted local put full synth in my (current) Land Cruiser at (a certain) intervall, which serves me well. Per data, see "oil analysis" prior which removes any subjectivelity.
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