# Oil weight **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** oil\ **Created:** [June 10, 2016, 2:15am UTC](https://community.cartalk.com/t/oil-weight/93496 "2016-06-10T02:15:52Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![badbearing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/badbearing/32/10683_2.png) [@badbearing](https://community.cartalk.com/u/badbearing)\ **Post date:** [June 10, 2016, 2:15am UTC](https://community.cartalk.com/t/oil-weight/93496/1 "2016-06-10T02:15:52Z")
I wonder what weight oil would be best in my 98 4.0 jeep 160,000 miles ---
**Author:** ![ken\_green](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/ken_green/32/816_2.png) [@ken\_green](https://community.cartalk.com/u/ken_green)\ **Post date:** [June 10, 2016, 2:35am UTC](https://community.cartalk.com/t/oil-weight/93496/2 "2016-06-10T02:35:25Z")
First off, what viscosity was recomended when it was new ? next, Does it show any signs of engine noise , smoking, or oil consumption? My 130k Expedition and the former 130k 92 Explorer always just used their o.e. oil weight ---
**Author:** ![BillRussell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/billrussell/32/3179_2.png) [@BillRussell](https://community.cartalk.com/u/BillRussell)\ **Post date:** [June 10, 2016, 2:35am UTC](https://community.cartalk.com/t/oil-weight/93496/3 "2016-06-10T02:35:36Z")
What does the users manual say? ---
**Author:** ![Cliff51](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cliff51/32/120_2.png) [@Cliff51](https://community.cartalk.com/u/Cliff51)\ **Post date:** [June 10, 2016, 2:46am UTC](https://community.cartalk.com/t/oil-weight/93496/4 "2016-06-10T02:46:06Z")
One more vote for whatever the owner’s manual says. ---
**Author:** ![BillRussell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/billrussell/32/3179_2.png) [@BillRussell](https://community.cartalk.com/u/BillRussell)\ **Post date:** [June 10, 2016, 2:47am UTC](https://community.cartalk.com/t/oil-weight/93496/5 "2016-06-10T02:47:47Z")
If you lost the owner’s manual, you can get a copy online. ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [June 10, 2016, 2:50am UTC](https://community.cartalk.com/t/oil-weight/93496/6 "2016-06-10T02:50:42Z")
Good Grief !!! How hard is it to make a decision on what kind of oil to use. ---
**Author:** ![ken\_green](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/ken_green/32/816_2.png) [@ken\_green](https://community.cartalk.com/u/ken_green)\ **Post date:** [June 10, 2016, 3:17am UTC](https://community.cartalk.com/t/oil-weight/93496/7 "2016-06-10T03:17:01Z")
Hence the reason for my second question. What is going on NOW . . different from the last 160k . . that would cause one to pose this query ? So, now we wonder about such things as high mileage oil. YET . . the OP has not replied yet to fill in the blanks. ---
**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\ **Post date:** [June 10, 2016, 4:00am UTC](https://community.cartalk.com/t/oil-weight/93496/8 "2016-06-10T04:00:42Z")
If the manual is gone, the oil requirements might be upon the oil cap or a label under the hood. ---
**Author:** ![galant](https://avatars.discourse-cdn.com/v4/letter/g/77aa72/32.png) [@galant](https://community.cartalk.com/u/galant)\ **Post date:** [June 10, 2016, 4:01am UTC](https://community.cartalk.com/t/oil-weight/93496/9 "2016-06-10T04:01:52Z")
I am wondering if this car has “badbearing”. ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [June 10, 2016, 4:27am UTC](https://community.cartalk.com/t/oil-weight/93496/10 "2016-06-10T04:27:21Z")
I’d bet money that without additional information everyone here is going to say “what does the owner’s manual say?” because that’s the only correct answer. If you don’t have the manual, and can’t find it designated on a sticker under the hood, try a Google search. If there IS a problem of some sort, such as high oil consumption, say so and we’ll be happy to try to help. ---
**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\ **Post date:** [June 10, 2016, 4:48am UTC](https://community.cartalk.com/t/oil-weight/93496/11 "2016-06-10T04:48:34Z")
I immagine the manual would say 10w30 for a 98 summer and 5w30 for winter, but yeah, the manual. ---
**Author:** ![BillRussell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/billrussell/32/3179_2.png) [@BillRussell](https://community.cartalk.com/u/BillRussell)\ **Post date:** [June 10, 2016, 4:55am UTC](https://community.cartalk.com/t/oil-weight/93496/12 "2016-06-10T04:55:35Z")
At least tell us which model jeep, and which engine. ---
**Author:** ![JoeMario](https://avatars.discourse-cdn.com/v4/letter/j/3bc359/32.png) [@JoeMario](https://community.cartalk.com/u/JoeMario)\ **Post date:** [June 10, 2016, 5:01am UTC](https://community.cartalk.com/t/oil-weight/93496/13 "2016-06-10T05:01:55Z")
His previous discussions dealt with a 98 Jeep Wrangler with a 4.0 engine. ---
**Author:** ![Barkydog](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/barkydog/32/2470_2.png) [@Barkydog](https://community.cartalk.com/u/Barkydog)\ **Post date:** [June 10, 2016, 5:07am UTC](https://community.cartalk.com/t/oil-weight/93496/14 "2016-06-10T05:07:00Z")
How about high mileage castrol ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [June 10, 2016, 5:08am UTC](https://community.cartalk.com/t/oil-weight/93496/15 "2016-06-10T05:08:28Z")
1998 Wrangler 4.0L; **Engine Oil** API Classification SH or SH/CD or Above Above 0°F (-18°C) 10W-30 Below 60°F (16°C) 5W-30 ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [June 10, 2016, 5:36am UTC](https://community.cartalk.com/t/oil-weight/93496/16 "2016-06-10T05:36:47Z")
That makes sense . . . One of my relatives has a 2004 Grand Cherokee 4.0 . . . and the manual says 10w30 Anyways, speaking of looking at the oil filler cap . . . Several years ago, a colleague of mine at work walked over because his next job was a Prius, and he wasn’t sure what oil it got, because he had never worked on one. I walked over, looked at the oil filler cap . . . saw that it was obviously a factory cap . . . and said “5w30” and then I walked away and went back to work There was no owner’s manual in the glove box, and he wasn’t very computer savvy . . . or else he might have looked up the owner’s manual online. And he didn’t think to look at the cap. To be fair, I’ve worked on some Toyotas where the cap doesn’t say I’ve noticed that many factory oil filler caps say the viscosity, yet many/most aftermarket caps do not. Perhaps OP has lost the factory oil filler cap and is using an aftermarket ---
**Author:** ![badbearing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/badbearing/32/10683_2.png) [@badbearing](https://community.cartalk.com/u/badbearing)\ **Post date:** [June 10, 2016, 9:06pm UTC](https://community.cartalk.com/t/oil-weight/93496/17 "2016-06-10T21:06:42Z")
Recent engine knock. 10-30 Summer. I got that. Just thought maybe after 160,000 miles a different weight might be better. Engine knock occurred after i put lucas in and then drove to the high rockies where it was still freezing at night. Coincidence? Engine has never used oil… ---
**Author:** ![BillRussell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/billrussell/32/3179_2.png) [@BillRussell](https://community.cartalk.com/u/BillRussell)\ **Post date:** [June 10, 2016, 9:13pm UTC](https://community.cartalk.com/t/oil-weight/93496/18 "2016-06-10T21:13:48Z")
knock? do you mean pinging? You might try a higher octane gas, there may be carbon buildup. Oil won’t change pinging. Serious pinging will cause engine damage. ---
**Author:** ![sgtrock21](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/sgtrock21/32/246_2.png) [@sgtrock21](https://community.cartalk.com/u/sgtrock21)\ **Post date:** [June 11, 2016, 7:34pm UTC](https://community.cartalk.com/t/oil-weight/93496/19 "2016-06-11T19:34:20Z")
My 1991 Jeep Cherokee 4.0L used the recommended 10W-30 year round for it’s entire 10 year/150,000 mile life span. ---
**Author:** ![badbearing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/badbearing/32/10683_2.png) [@badbearing](https://community.cartalk.com/u/badbearing)\ **Post date:** [June 11, 2016, 11:06pm UTC](https://community.cartalk.com/t/oil-weight/93496/20 "2016-06-11T23:06:12Z")
Its not pinging… Ok lets try this… Is it ok to put synthetic in an engine that has had conventional its whole life? [Next page](https://community.cartalk.com/t/oil-weight/93496.md?page=2)