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Straight 30w in Hot Climates #5311070 01/02/20 01:24 PM
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ad244 Offline OP
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Hi BITOG users,

Anybody using straight 30wt in hotter climates n their passenger vehicles? - I'm talking the greater CA/AZ area where temps rarely dip into freezing temps. Would a vehicle which is spec'd for 5w-30 have any issues with this?

Thanks!

Re: Straight 30w in Hot Climates [Re: ad244] #5311079 01/02/20 01:29 PM
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JustN89 Offline
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If it got anywhere close to 32F, I personally wouldn't run it. I'd only use it in the summer, but even then, I'd only do it to use up something that I already had. Otherwise, there'd be no point for me to use it over a 5W-30.

Re: Straight 30w in Hot Climates [Re: ad244] #5311081 01/02/20 01:31 PM
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JEL01 Offline
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What kind of car/engine?

I wouldn’t unless it’s a smoking old beater that drinks tons of oil, or you’re racing it, or you have several 55 gallon drums.

I’d save it for the lawn mower personally

Last edited by JEL01; 01/02/20 01:31 PM.

Cars I maintain:
02 Mercedes CLK430
09 Honda Accord V6
13 Lexus RX350 AWD
02 Toyota Tundra 4x4
18 Lexus GX460
Re: Straight 30w in Hot Climates [Re: JEL01] #5311086 01/02/20 01:35 PM
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kschachn Offline
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Originally Posted by JEL01
What kind of car/engine?

I wouldn’t unless it’s a smoking old beater that drinks tons of oil, or you’re racing it, or you have several 55 gallon drums.

I’d save it for the lawn mower personally

By what measure? If the oil carries the required specification for his engine, a straight-weight oil is entirely appropriate for moderate temperatures.


1994 BMW 530i, 251K
1996 Honda Accord, 280K
1999 Toyota Sienna, 430K
2000 Toyota ECHO, 284K
Re: Straight 30w in Hot Climates [Re: ad244] #5311087 01/02/20 01:35 PM
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CT8 Online Content
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What are you expecting to gain? Longer engine life? Possible lowered oil consumption? I am not one to regurgitate marketing claims but engines usually out last the vehicles they are put in with oil from the majors plus proper maintenance and operation. No oil on Earth will keep a part from breaking or cover a manufacturing or metallurgy failure


2015 F150 2.7
2018 F350 6.2
Re: Straight 30w in Hot Climates [Re: ad244] #5311088 01/02/20 01:37 PM
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Chris142 Offline
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My jeep is much quieter and smoother on sae30 than 10w30. I run sae30 in my tractor too.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Straight 30w in Hot Climates [Re: ad244] #5311097 01/02/20 01:45 PM
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BLND1 Offline
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Why not go with a 10w30 in those climates?

Re: Straight 30w in Hot Climates [Re: ad244] #5311103 01/02/20 01:47 PM
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userfriendly Offline
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I ran Duron SAE 40 in my LML Duramax last summer for 10,000 miles. Best UOA so far.
Weather permitting, I run mono-grade engine oils as often as possible.
The good ones are not cheap and usually have a few obsolete API approvals printed on the containers.
That does not mean the lubricant quality is obsolete. All major branded are group IIs with modern additive packages.

Re: Straight 30w in Hot Climates [Re: ad244] #5311109 01/02/20 01:51 PM
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Grandpa always used straight 30 and he lived to be 95. laugh


If you want the job done right......do it yourself.
Re: Straight 30w in Hot Climates [Re: ad244] #5311111 01/02/20 01:53 PM
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maxdustington Offline
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On something that just uses the oil in a conventional lubricating function, [censored] yeah! This is BITOG!

Modern cars where the oil is used to drive VVT or cylinder deactivation or is used as a sort of hydraulic fluid? I wouldn't run a SAE30 in that.


99 Toyota Tercel CE 5EFE/C151
Re: Straight 30w in Hot Climates [Re: ad244] #5311116 01/02/20 01:55 PM
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I grew up in Pomona and if it dropped below 50, it was considered a freaking polar vortex!😂 The avg for that part of LA county in winter is 44f, avg high is 70. Use a SAE30 or 10w30 no sweat..I did for years living down there.

Last edited by Mad_Hatter; 01/02/20 01:56 PM.
Re: Straight 30w in Hot Climates [Re: ad244] #5311185 01/02/20 03:03 PM
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gfh77665 Offline
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I have used SAE 30 and SAE 40 for years with great results in SE TX. 1998 Chevy pick up with V6.

Re: Straight 30w in Hot Climates [Re: ad244] #5311186 01/02/20 03:04 PM
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ad244 Offline OP
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It would be for a Toyota!

Re: Straight 30w in Hot Climates [Re: ad244] #5311202 01/02/20 03:27 PM
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PimTac Offline
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Originally Posted by ad244
It would be for a Toyota!




That narrows it down.


2017 Mazda CX5
Valvoline Advanced Synthetic 0w20
Roki OEM filter.
Re: Straight 30w in Hot Climates [Re: ad244] #5311208 01/02/20 03:32 PM
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The answer will generally be yes as long as it is hot enough that it will flow on startup. You didn't answer as to why?

Is there a problem you are trying to solve? SAE30 probably cost more since the rebates on synthetic are generally #W-## oil and you can generally get them for $3/qt or lower. Few make a SAE30 in synthetic. This means it will shear down and leave deposits like the oils of old compared to a modern group III walmart synthetic. No real compelling reason to use it.

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