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0w20 Mobil 15k or castrol 15k ? #5134304 06/14/19 06:19 PM
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Jimkobb Offline OP
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My 2014 Corolla calls for 0w20 oil and I stick with that. I have been using Mobil oil up to my last oil change I used the castrol 15k oil . They both make a 15k oil and the price isn`t bad at Walmart so these are what I want to stick to. I`m sure both are quite good . My question is of these 2 which do you think might be better?


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Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5134308 06/14/19 06:22 PM
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Propflux01 Offline
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Mobil is my preference.


2014 Hyundai Elantra
2014 Hyundai Elantra GT

A 55 Gallon Drum And A Shovel Can Solve A lot of Life's Little "Problems"
Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5134313 06/14/19 06:37 PM
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Pelican Offline
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The 1st thing to ask is under what circumstances was it good for 15K!

Your way of driving probably is a lot more demanding than a test made for advertising purposes.
You money your decision.

Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5134410 06/14/19 08:45 PM
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If you're satisfied with how either have performed, use whichever is cheapest at the time.

This reminds me of some posts which go like..."I like M1 and it works great for me, now talk me out of it" 😂..you already know these are quality oils and not some sketchy oil with no API/ILSAC rating so ultimately your empirical evidence should trump anything anyone else has to say.

Last edited by Mad_Hatter; 06/14/19 08:47 PM.
Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5134567 06/15/19 01:15 AM
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Marco620 Offline
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Ask Tig1.He's been on the light oil diet. I would shop on price or availability as to which I would select. Both will do it if your driving style permits.


15' Civic 1.8 i-vtec 262,000 mi Redline 5w20, BP Cvt fluid, Archoil9100
Tornado Chaser/Doberman Whisperer
Son of a Navy Corpsman.


Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5134573 06/15/19 01:32 AM
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PlzRepond Offline
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Are you using it the full 15k? I doubt it matters much. 1. It’s a Toyota 2. Both are great options from big names

Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5134579 06/15/19 01:54 AM
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OilUzer Offline
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Whatever you do, forget the 15K oci ... Too high imho.

Re: 0w20 Mobil 15k or castrol 15k ? [Re: OilUzer] #5134598 06/15/19 04:01 AM
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Linctex Offline
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Originally Posted by OilUzer
Whatever you do, forget the 15K oci ... Too high imho.


It depends on the engine, and driving style.

15,000 miles is about 2-3 months for me - - pretty much all highway.

My "AutoZone clearance $10 jug" of Mobil 1 5W-20 Annual Protection has over 15,000 miles on it already.

I dare anyone to claim that it's "starting to sludge up" so I can shoot them down....


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5134712 06/15/19 08:15 AM
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Jimkobb Offline OP
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No, I don`t do 15k miles ever. That is not my concern . I do an oil change about every 6 months maybe about 6k miles. My concern is one better than the other for making the the engine last longer.
At Walmart they cost about $27 for 5 quart jugs. Yes, I could go cheaper oil and save $20 over a years time but not important to me in the least.


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Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5134800 06/15/19 10:20 AM
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I don’t think a. Ore expensive synthetic oil will help your engine last longer if you are doing 6month/6k mile change. The expense is wasted and the gains I protection are not there. Those 15k formulations are meant to keep the oil serviceable for a longer duration. What you are doing now with the caveat that you can use whatever 0w20 is on sale, will get you the most out of your engine.
Originally Posted by Jimkobb
No, I don`t do 15k miles ever. That is not my concern . I do an oil change about every 6 months maybe about 6k miles. My concern is one better than the other for making the the engine last longer.
At Walmart they cost about $27 for 5 quart jugs. Yes, I could go cheaper oil and save $20 over a years time but not important to me in the least.


2018 Trd Pro 4Runner
2018 Tacoma off-road

Dealer 0w20 to M1 0w40 FS -it depends
Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5134807 06/15/19 10:34 AM
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Triple_Se7en Offline
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Originally Posted by Jimkobb
My 2014 Corolla calls for 0w20 oil and I stick with that. I have been using Mobil oil up to my last oil change I used the castrol 15k oil . They both make a 15k oil and the price isn`t bad at Walmart so these are what I want to stick to. I`m sure both are quite good . My question is of these 2 which do you think might be better?

The better one is what your engine likes best. Not what you or I like best.


19 Hyundai SantaFe 2.4GDI Castrol Edge 5w30 / NAPA Mann-Hummel filter / 6oz Liqui-Moly Treatment
04 Colorado 3.5 Castrol Edge 0W40 Euro & K&N filter
03 Malibu 3.1 QS / Valv Syn 5w30 mix Fram EG filter
Re: 0w20 Mobil 15k or castrol 15k ? [Re: Triple_Se7en] #5134878 06/15/19 12:01 PM
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Originally Posted by Triple_Se7en

The better one is what your engine likes best. Not what you or I like best.


+1... and from the sounds of it, both of them seem to be working fine in his engine. So this is the easiest question to answer ever IMO...just pick one and stock up on it and be done with it.

Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5134922 06/15/19 01:02 PM
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Both are excellent, as are Valvoline and Pennzoil oils. 15K OCI oils are over-the-top. I've been changing oils for 50 years and have never went over 8K .... even when using EP oils. Currently have been averaging 5-6K OCIs using top name brands.

In retrospect to cost of the new vehicle, respect and take care of your vehicles, much sooner than 15K OCIs

Last edited by Triple_Se7en; 06/15/19 01:04 PM.

19 Hyundai SantaFe 2.4GDI Castrol Edge 5w30 / NAPA Mann-Hummel filter / 6oz Liqui-Moly Treatment
04 Colorado 3.5 Castrol Edge 0W40 Euro & K&N filter
03 Malibu 3.1 QS / Valv Syn 5w30 mix Fram EG filter
Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5134926 06/15/19 01:06 PM
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PlzRepond Offline
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Originally Posted by Jimkobb
No, I don`t do 15k miles ever. That is not my concern . I do an oil change about every 6 months maybe about 6k miles. My concern is one better than the other for making the the engine last longer.
At Walmart they cost about $27 for 5 quart jugs. Yes, I could go cheaper oil and save $20 over a years time but not important to me in the least.


Hey man, if you’re doing changes that often it likely makes zero difference. The factory recommended oci is 10k no? And I think the manual states any api latest spec at the time oil is OK.

Re: 0w20 Mobil 15k or castrol 15k ? [Re: Jimkobb] #5135022 06/15/19 02:58 PM
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addyguy Offline
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If I had to choose between the two, I'd choose the Mobil 1 product.

Why? Have seen more tests/UOA's/studies that show the M1 product will do it without issue.


2010 Kia Soul 2U - 2.0L I-4, auto; 145k miles.
Castrol GTX HM 5W-30, STP blue bottle; Fram TG 9688.

2009 Pontiac G5 - 2.2 I-4, auto, 121k miles.
Oil/filter TBD
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