Engine oil....help needed on choices

As long as we are doing vehicle advice ...

Places have started advertising "deals" on semi-synthetic and synthetic oil/filter changes.

What's the good and bad of each vs. regular? Any issues switching from one to another?

Jeep Wrangler 4.0 liter, 6 cylinder. Sixteen year old engine, 70K, good shape, doesn't burn oil, always had regular changes. So far it's only been feed used dinosaurs.

50-50 around town and highway haul ass with some off-road crawling. Arizona stinking hot summers and mild winters.

Any advantage/harm "trading up"?

Reply to
Loading thread data ...

Depends on what ya been burning up til now . I switched from a paraffin based eastern crude to Castrol in a truck (86 GMC 305 cid) and it started burning oil because the oil cut the paraffin based crud/deposits from the valve seals . Replaced them while I had it down for a timing set R&R and all is now well .

Reply to
Terry Coombs

As long as your engine is dry on the outside, I wouldn't change anything.

Reply to
Red Prepper

"stinking hot" Arizona, I'd be using Synthetic for sure. (I do here in Ontario too) No issues with switching - the first change of synthetic you might want to do a bit sooner than if it was already on Synth - the stuff will purge a bit of crap from the engine if it has been neglected at all. You are putting the miles on it pretty slowly - a good synth changed once a year or so should do fine. For your use, I'd look at a synthetic "all fleet" diesel rated oil like shell Rotella T6 5w40, or even a T5 synthetic blend if you want to "cheap out" a bit. Won't give the protection of the T6, but better than what you are using now. The all-fleet oil will have more EP additives than your standard gasoline engine oils (More Zinc)

Reply to

On 07/02/2017 5:19 PM, Terry Coombs wrote: ...

+1 on the paraffin-based. Had old Chevy 350 plug up the return holes on 7 and 8 cylinders from the crap one of them left in the upper valve covers -- was one of the early pollution-control systems and consequently ran hotter than earlier of same vintage; was the death knell for it. Rebuilt with new mains and all and did the switch to Castrol and it did another 250K before donating it to one of the charitable contributions outfits...
Reply to

My advice "as a mechanic" is to use synthetic where either extreme high or extreme low temperatures are encountered. Been using it exclusively on my own vehicles for about 8 years here in central Ontario on my Fords and my last Mopar. I don't put on a lot of miles and I change twice a yeat (the 21 year old truch has about 350000km on it, the 16 year old car 108,000)

Reply to

Mobil 0w10 is excelent gun oil I mostly use valvoline full synthetic of the proper weight in my vehicles

Reply to

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.