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What's your viscosity change threshold? #5383028 03/22/20 02:55 PM
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HyundaiAbuser Offline OP
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Some folks here are thickies and some prefer thin but what specific circumstances would cause you to change your oil viscosity from the standard or most common for your vehicle? For me I take a lot of summer trips so my 5 speed tiburon gets its share of hours sitting at about 3.5-4k rpm so I step to a Xw40 for peace of mind. I can imagine that a thinner 0w20 or 0w16 would be beneficial for long idling and low rpm applications.


03 Hyundai Tiburon:
PP High Mileage 5w30
Amsoil MTG
94 Mazda B4000
Supertech 10w40 High Mileage
Valvoline Dex/Merc
Re: What's your viscosity change threshold? [Re: HyundaiAbuser] #5383037 03/22/20 03:07 PM
Joined: Jan 2013
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LotI Offline
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I am comfortable going up or down one grade, with special consideration to ACEA standards.

I ran 0w-20 in a 4.6l Trailblazer (30 grade spec), and I’ve used a 30 in a Mazda SkyActiv and Honda K24(20 grade).

I always look at international standards for the same engine and consider the usage. The internet makes it easy to find. For example Mazda SkyActiv normally aspirated engines use 0w-20 in the US and Canada but allow pretty much anything under the sun elsewhere.

If I were a short-tripper I would consider a thinner oil. I drive 2-300 miles/day so I’m a thickie.


03 Honda Interceptor
11 Kawasaki KLR 650
12 Ford E450
19 Buick Regal TourX
Re: What's your viscosity change threshold? [Re: HyundaiAbuser] #5383046 03/22/20 03:25 PM
Joined: Nov 2008
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JC1 Offline
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I'm comfortable using going from 0w-20 to 5w-30 if a car called for 0w-20. I used to use 5w-50 Castrol Edge a long time ago, but 30 weight is my max for the cars in my signature.

Up here in Canada 10w-40 isn't easy to get and I don't have any cars that call for 0w-40 or 5w-40.

Last edited by JC1; 03/22/20 03:26 PM.

2015 Grand Caravan SXT Plus 0w-20 Pennzoil Ultra/Fram Ultra Filter
1997 Honda Civic CX 5w-30 PPPP/Fram Ultra Filter
Re: What's your viscosity change threshold? [Re: HyundaiAbuser] #5383048 03/22/20 03:29 PM
Joined: May 2019
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Mad_Hatter Offline
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Originally Posted by HyundaiAbuser
For me I take a lot of summer trips so my 5 speed tiburon gets its share of hours sitting at about 3.5-4k rpm so I step to a Xw40 for peace of mind. I can imagine that a thinner 0w20 or 0w16 would be beneficial for long idling and low rpm applications.

3~4k rpm on the highway is gonna be what, somewhere in the 80's mph?..I can't go that fast for too long here in WA before Trooper Joe tags me. And tickets get real expensive here once you're over 70.. trust me, I know. coffee

Anywho...

I use a 5w30 or 10w even though the OM says to run a Xw20, but it's (5w30/10w30) working for me. I do have 10qts of Valvoline ML 10w40 I scored on the cheap that I plan to run this summer.

Last edited by Mad_Hatter; 03/22/20 03:33 PM.
Re: What's your viscosity change threshold? [Re: Mad_Hatter] #5383052 03/22/20 03:36 PM
Joined: Feb 2013
Posts: 3,922
Silverado12 Offline
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Originally Posted by Mad_Hatter
Originally Posted by HyundaiAbuser
For me I take a lot of summer trips so my 5 speed tiburon gets its share of hours sitting at about 3.5-4k rpm so I step to a Xw40 for peace of mind. I can imagine that a thinner 0w20 or 0w16 would be beneficial for long idling and low rpm applications.

3~4k rpm on the highway is gonna be what, somewhere in the 80's mph?..I can't go that fast for too long here in WA before Trooper Joe tags me. And tickets get real expensive here once you're over 70.. trust me, I know. coffee

Anywho...

I use a 5w30 or 10w even though the OM says to run a Xw20, but it's (5w30/10w30) working for me. I do have 10qts of Valvoline ML 10w40 I scored on the cheap that I plan to run this summer.



Yeah, that's a lot of rpms. As a comparison, my Mustang is a little over 2K at 70 mph.


12 Chevy Silverado ext. cab LS, 2WD 4.3 auto
18 Mustang GT 5.0 auto
07 Harley Dyna Street Bob 96 c.i. 6 sp.
00 Mustang GT auto
Re: What's your viscosity change threshold? [Re: HyundaiAbuser] #5383063 03/22/20 03:50 PM
Joined: Aug 2011
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Blkstanger Offline
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I run a 5w30 in my Escape that calls for 5w20. If it were any cooler here in my part of the Country I'd stick with 5w20 but it's blazing hot most of the year. I have been out in 117* heat before. The 2.5 will handle just about any weight oil.


99 Jeep WJ 4.7 200,000mi. Maxlife 10w30, Fram Ultra.
15 Ford Escape S 2.5, 75,000mi. Castrol Edge EP 5w30 Fram Ultra.
Re: What's your viscosity change threshold? [Re: HyundaiAbuser] #5383069 03/22/20 03:54 PM
Joined: Sep 2002
Posts: 4,024
Propflux01 Offline
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I run the same - 5w-30 instead of 5w-20


2014 Hyundai Elantra
2014 Hyundai Elantra GT
Re: What's your viscosity change threshold? [Re: HyundaiAbuser] #5383073 03/22/20 04:16 PM
Joined: Sep 2010
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4WD Offline
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Maybe mileage … bumped up a couple motors one grade at 100k …

Re: What's your viscosity change threshold? [Re: HyundaiAbuser] #5383077 03/22/20 04:23 PM
Joined: Nov 2015
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Starman2112 Offline
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I’m strictly by the OM for the life of the vehicle.


2018 Toyota Tacoma SR5, 4X4, 2.7L / Mobil 1 AFE 0W-20 / OEM filter
2010 Toyota Camry LE, 2.5L / Mobil 1 AFE 0W-20 / OEM filter
Re: What's your viscosity change threshold? [Re: HyundaiAbuser] #5383087 03/22/20 04:37 PM
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Yah-Tah-Hey Offline
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Viscosity what?

Re: What's your viscosity change threshold? [Re: HyundaiAbuser] #5383094 03/22/20 04:42 PM
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Mainia Offline
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Thickie here, I am on 17 lbs boost at 1,400 rpm a lot. Mobil 1 5w-30 ESP a thick 5w-30 is my minimum. 5w-40 is a Hyundai approved option, I have not nailed my brand and formula down yet like I have with the 5w-30. I will never go below 11.8 @100C and min. HTHS 3.5.


2018 Lowered Hyundai Kona AWD 1.6T
2014 Toyota Rav4 AWD
2005 Honda Civic
Re: What's your viscosity change threshold? [Re: HyundaiAbuser] #5383103 03/22/20 04:50 PM
Joined: Mar 2008
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ZZman Offline
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None really. I use either 5-20 or 5-30. No real reason why except maybe I think a 30 would work better on a higher mileage engine with some wear.


2005 Toyota Avalon XLS 3.5 motor
2014 Ford Fusion 2.5 motor
Re: What's your viscosity change threshold? [Re: HyundaiAbuser] #5383104 03/22/20 04:50 PM
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Jackson_Slugger Offline
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My 01' Sable recommends 5W-20 but I'm fine going 5W-30 in summer, I would go a 0/5W-40 is it uses much. In Fall through Spring I'm running 0/5W-20...

Re: What's your viscosity change threshold? [Re: Jackson_Slugger] #5383138 03/22/20 05:34 PM
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blufeb95 Offline
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Originally Posted by Jackson_Slugger
My 01' Sable recommends 5W-20 but I'm fine going 5W-30 in summer, I would go a 0/5W-40 is it uses much. In Fall through Spring I'm running 0/5W-20...

If you get a euro spec 0w40 it's more like a thick 30 anyways.

Re: What's your viscosity change threshold? [Re: blufeb95] #5383148 03/22/20 05:48 PM
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Jackson_Slugger Offline
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Originally Posted by blufeb95
Originally Posted by Jackson_Slugger
My 01' Sable recommends 5W-20 but I'm fine going 5W-30 in summer, I would go a 0/5W-40 is it uses much. In Fall through Spring I'm running 0/5W-20...

If you get a euro spec 0w40 it's more like a thick 30 anyways.


Yeah, I have a fair amount of Valvoline MST 0W-40 which is that, and mostly PAO AFAIK. And some 5W-30's that Pennzoil make really aren't far from a thicker 20W....

I should also mention that some oil sites like Valvoline and Pennzoil also recommend 5W-30 for my car whereas Mobil adheres to the OM...

At this point the older goes first this spring, which is MSS 5W-30.

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