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#4511465 - 09/09/17 11:01 AM What is considered (cold start ) temp?
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: AZ
Where i live, it doesn't drop below 30*f.

In the summer, its constantly 100f to 123f for 4 months straight.

So what would be considered cold for hdeo oils ? Do i need worry cold starts?

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#4511475 - 09/09/17 11:15 AM Re: What is considered (cold start ) temp? [Re: leroyd92]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2382
Loc: Balearic Islands , Spain
With HDEO is assume you mean a 15W-40 HDEO?
I would personally not use 15W-40 in temps below -10C ( +15F ) unless the engine was plugged in with a heater, at those temperatures however i would probably choose a full synthetic 5W-40 though.

So if it doesn't go below freezing where you live you should be ok with a 15W-40 HDEO all year.

I've started my car with 20W-50 in the sump at slightly below freezing without issues, although ofcourse being very gentle and being careful not to rev the engine too much for the first few minutes of running.
_________________________
1975 Ford Capri II Ghia 3000 V6, - Valvoline VR1 20W-50
1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Shell Rimula R4X 15W-40 HDEO.

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#4511486 - 09/09/17 11:34 AM Re: What is considered (cold start ) temp? [Re: leroyd92]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18173
Loc: Dallas,Tx USA
I consider "cold "starts" the very first of the day startups.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 0W20



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#4511502 - 09/09/17 12:00 PM Re: What is considered (cold start ) temp? [Re: leroyd92]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2382
Loc: Balearic Islands , Spain
Yes, technically even if it's 100F outside it's a cold start, because it's still a fair bit below operating temperature.
_________________________
1975 Ford Capri II Ghia 3000 V6, - Valvoline VR1 20W-50
1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Shell Rimula R4X 15W-40 HDEO.

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#4511510 - 09/09/17 12:14 PM Re: What is considered (cold start ) temp? [Re: aquariuscsm]
compratio10_5 Offline


Registered: 12/07/15
Posts: 83
Loc: Pocatello, Idaho
Originally Posted By: aquariuscsm
I consider "cold "starts" the very first of the day startups.


I agree with the above as far as the engine is concerned. Pistons have to reach operating temperature of 400 to 500 F to expand into their design shape and dimensions. Engines should be operated gently until these clearances are established. You will not have any problem with 15W-40 HDEO pumpability at your temperatures, but it is still a good idea to drive gently until oil temperature is above roughly 160F so that there is no chance of the oil filter by-pass valve opening at high RPM's with higher viscosity oil. Even if the coolant temperature gauge reads on the dial when first started, the engine is not really warmed up until it operates for 5 minutes in hot ambient temperatures or 10 minutes in cold temperatures.
_________________________
It's not what you don't know that hurts, it's what you think you know that ain't so. Will Rogers

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#4511529 - 09/09/17 12:38 PM Re: What is considered (cold start ) temp? [Re: leroyd92]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
Originally Posted By: leroyd92
Where i live, it doesn't drop below 30*f.

In the summer, its constantly 100f to 123f for 4 months straight.

So what would be considered cold for hdeo oils ? Do i need worry cold starts?


For you, 30F.

No you don't need to worry, even with a 15wxx oil.
_________________________
Thick vs Thin test: 15k / 43k miles complete

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#4511544 - 09/09/17 12:59 PM Re: What is considered (cold start ) temp? [Re: leroyd92]
Killer223 Offline


Registered: 05/07/15
Posts: 389
Loc: AZ
i know several people that use a straight grade oil in PHX year round. some use 30, some 40, no issues.
_________________________
08 6.7 cummins G56
04 5.9 cummins
11 ranger 4.0
16 KTM 250 XC

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#4511551 - 09/09/17 01:11 PM Re: What is considered (cold start ) temp? [Re: leroyd92]
WillsYoda Offline


Registered: 10/17/15
Posts: 471
Loc: MN
I assume you mean temps that make starting harder on the engine due to the cold. For me -5F is around the temp where a conventional 5w30 shows cold starting problems relative to synthetic.

At -15F it starts to get really pronounced. I used Maxlife 5w30 blend for years, and got a horrible shaking on -15 startups. I got "mayonnaise" in the oil cap all winter from mixing the oil with condensation.

Then I went to 5w30 PP, and all those issues went away. Smooth starts at -25F and never any mayonnaise in the oil cap.

In AZ, you would not need to worry, unless you run 20w50 or something like that and it got to 10F. Even 10w40 would be fine all year in AZ.

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#4511570 - 09/09/17 01:44 PM Re: What is considered (cold start ) temp? [Re: leroyd92]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1810
Loc: Saskatchewan, Canada
Any start below operating temperature is a "Cold Start" as referred to in automotive literature, service documents, or oil specifications. If it's a specific reference to the environment the engine is operated in, they will state it as " hot/warm/cool/cold etc. ambient temperature".
_________________________
'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]

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#4511577 - 09/09/17 01:55 PM Re: What is considered (cold start ) temp? [Re: leroyd92]
BJD78 Offline


Registered: 08/05/17
Posts: 493
Loc: Nebraska
Lived in Fargo ND back in the late 90's for 2 winters and had a 94 Camry that ran Napa 5w30 started easily and many many days were below zero and a few days would reach the -20s but then again 4 bangers tend to start easier than the big V8's. Saw many big V8s struggle to start in minus temps .. probably due more to weak battery rather than oil. Now in Nebraska and we get very few below zero days but do get a few.. have had zero issues with my current vehicles using 5w20 conventional oil. Temps above 30f are certainly not going to be an issue.
_________________________
2010 Forester:122K
2009 Sonata :189K
2010 Tucson:55K

OCI 5K using the cheapest dino oil I can buy,usually NAPA or TSC Travelers oil.

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#4511614 - 09/09/17 02:56 PM Re: What is considered (cold start ) temp? [Re: leroyd92]
dparm Offline


Registered: 04/19/10
Posts: 13466
Loc: Chicago, IL
The connotation of "cold start" is more along the lines of "colder than the oil's normal operating temperature". It's not necessarily referring to the ambient temperature of the air. Even if the ambient temp is 100 F, that's still way lower than the usual ~190-200F most oil sumps operate at. The oil will be much thicker at 100F and hence wear is increased.
_________________________
2017 Chevrolet Corvette Grand Sport

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#4511678 - 09/09/17 04:40 PM Re: What is considered (cold start ) temp? [Re: leroyd92]
69GTX Offline


Registered: 09/23/15
Posts: 3815
Loc: Connecticut
Any start below an oil temp of approx 165-175 deg F is a cold start, at least from the standpoint of the engine producing and accumulating corrosion products. Once at normal oil temps 175-185 deg F the "damage" from cold starting/warm up is essentially over.

The car mfg's test their engines & oils in the 130-150 deg (oil temp) corrosion range for X number of hours to see how well the oil holds up. At colder temps the oil's cold viscosity is supplying a strong benefit. Once that's gone, and before normal oil temps, and before the oil's add package is fully functional when hot, is the range of 130-150 deg that you want to minimize. To me, cold start means conditions ripe for engine corrosion and wear.
_________________________
----------------

2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs

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