I sometimes use this instead of 10w-30 and was wondering if anyone else does.
Anyone use HD 30 in summer?
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My 2004 Subaru Impreza WRX manual has 30 (among other weights) as a recommendation for desert heat or towing duty. I't doesn't define "desert heat", but I'd guess Summer in Arizona would count.
BTW - which 30 weight? Some are actually thinner than others at ambient temps (esp Pennzoil HD-30).
BTW - which 30 weight? Some are actually thinner than others at ambient temps (esp Pennzoil HD-30).
In the Gulf States: Texas, Louisiana, Mississippi, Alabama: it gets so hot you could fry an egg on the sidewalk. I throw the manufacturer's recommendation of 5w-30 and 10w-30 out the window. Use Castrol HD-30 monograde. You won't regret it.
y_p_w
I did not realize that Pennzoil 30wt was "thin" at ambient temperatures. Where'd you get that info from?
I've seen Pennzoil "long life 30 wt" on the shelf right next to the HD-30wt. Is this their answer to the "thin-ness" of the regular 30wt?
I did not realize that Pennzoil 30wt was "thin" at ambient temperatures. Where'd you get that info from?
I've seen Pennzoil "long life 30 wt" on the shelf right next to the HD-30wt. Is this their answer to the "thin-ness" of the regular 30wt?
I was comparing spec sheets of the Pennzoil HD30 compared to Castrol HD-30. Pennzoil's HD-30 is a Group II oil with a relatively high VI. It's nowhere close to what their HD-30 would have been ten years ago, and it's certainly thinner at ambient temps than a straight 30 weight of that time, and close to that of a typical 10W-40. With that pour point, I would suspect that Pennzoil HD-30 might even contain pour point depressants.
Pennzoil HD-30: 98 cSt at 40°C / pour point at -36°C
Castrol HD30: ?? / pour point at -3°C
Exxon Superflo 30: 100 cSt at 40°C / pour point at -21°C
Exxon Superflo 10W-40: 94 cSt at 40°C / pour point at -33°C
http://www.pzlqs.com/Tech/Pdsheet/DomesticMarketing/EngineOils/pdf/HD.pdf
http://www.castrol.com/liveassets/b.../local_assets/downloads/p,q/pds_HD30_HD40.pdf
http://www.exxon.com/USA-English/Lubes/PDS/GLXXENPVLEXSuperflo.asp
Oh - LongLife seems to be diesel rated, and only has an older SJ rating. Otherwise it seems to have similar viscosity and pour characteristics as the HD-30. I used to think "straight weight" meant it had some sort of viscosity curve to follow.
http://www.sopus-staging.com/staging/longlife/site/LongLife.pdf
At Advanced auto, you can get Shell RotellaT 30W. It has a higher zinc content then the auto oils. If you have a auto with a cat that doesnt consume oil, I think it being a HDEO would when out over an auto oil.
Just one point.
Operating temperature is not 40C. 40C is the temperature your oil will be at if you're just starting the car up in Arizona on a Summer day, 104 F.
Operating temperature is probably closer to 100C or 212F for most cars, most of the time, except during the first 20 minutes or so of warm-up.
If you're racing or towing, then your oil's operating temperature may be substantially above 212F, in which case I hope you have a good cooling system on your engine and transmission.
I've been using mostly Pennzoil with the occasional dose of Castrol. I noticed the last batch of Pennzoil 30 was still SL rated so I assume it has the higher levels of zinc and phosphorous.
My friend uses 30 straight weight year round. His Jeep hit 177K of hard driving before he changed the rings. He had an oil burning problem.
What would you all say is the absolute lowest temperature you'd safely want to start an OHC engine with HD 30? I'm thinking of trying it in my Corolla to see if I can get the oil consumption down. I reported in my LC post that ol consumption had gone down, but I checked it the other morning and it was still the same. I never let it go to the add mark, but I'd guestimate it's burning around 1 quart every 1500 miles (all highway though - 3500 rpm sustained). Or I may go 50/50 HD 30 with 10w-30. I like the look of Maxlife's SAE 30 as it has a nice VI and a bit lower Cst @ 40C. Comments?
Castrol recommends their HD30 for temps over 40°F. If I had an oil burner I might consider a SAE 30 condidering where I live (San Francisco Bay ARea).
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Maybe May thru September in Pennsylvania weather.... but beyond that could create engine chatter during cold spells of spring & fall. Certainly not during winters there.
Yea, I'm thinking just June July and August around me area, but in the mountains it does get mighty cold, even in late July. I better just stick to 10w-30.
I think it's the other way around. The amount of allowed ZDDP has gone down in API SM, and some think that may degrade protection in air-cooled engines. I know the reduced ZDDP levels is a reason why Honda stopped spec'ing motor oil for using in their manual transmissions.
whats wrong with this thread? it doesn't fit on my screen.
I suspect that a straight 30 likely
is a 20w30. All it has to do is meet the 20w
specifications, but in most cases nobody cares,
so the producer doesn't bother to qualify it. I
think I can make a 15w30 by mixing 10w30 and
straight 30 in the right proportions.
I have the same impression. But then there are
oils like most Redline oil that are listed as
multigrade, but have no VIIs.
I use Chevron 30, Delo 400 or Supreme, in the summer in the 5.0 F-150 and used it in the previous truck, a 4.3 C-1500. Both these engines used too much 10W-30 in hot weather. I tried 15W-40 in the Ford all year, but hot oil pressure is more than sufficient with 30, and I am trying to get the best gas mileage I can at todays prices.
A friends motorhome with a Dodge 440 has always run nothing but Valvoline 30. Of course, it is only used in the summer.
A friends motorhome with a Dodge 440 has always run nothing but Valvoline 30. Of course, it is only used in the summer.
Good to see all the SAE 30 fans, as I got "beat-up" by the thin oil crowd in a SAE 30HD thread, a couple of months back!
Traditionally, the SAE 30's were in the 12 cSt @ 100C viscosity range and now several, such as Chevron/Havoline, are 10.3 cSt oils.
This is the same full operating temperature as many 5W & 10W-30's. Also, the SL & SM ZDDP levels in these oils clearly indicate that they are formulated for automotive use & not "lawnmowers".
Here's a temperature chart to compare start up temperatures of 5W-30 to SAE 30. Note that a start-up with SAE 30 at 70F is the same viscosity as 5W-30 at about 55 degrees.
And, someone correct me if I'm wrong, but in the northern states, we spend 6 months of the year with start-ups colder than 55 degrees.
Traditionally, the SAE 30's were in the 12 cSt @ 100C viscosity range and now several, such as Chevron/Havoline, are 10.3 cSt oils.
This is the same full operating temperature as many 5W & 10W-30's. Also, the SL & SM ZDDP levels in these oils clearly indicate that they are formulated for automotive use & not "lawnmowers".
Here's a temperature chart to compare start up temperatures of 5W-30 to SAE 30. Note that a start-up with SAE 30 at 70F is the same viscosity as 5W-30 at about 55 degrees.
And, someone correct me if I'm wrong, but in the northern states, we spend 6 months of the year with start-ups colder than 55 degrees.
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