Straight 30w in Hot Climates

SR5

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Down Under
I live in a warm climate and I have often thought of running a SAE30 monograde just for the fun of it. Unfortunately whenever I went to buy some, the monograde was never on sale, and it was always much cheaper to buy something like GTX 15W40. In the US you can get some very nice modern Group II based monogrades with modern additive packages rated API SN or SN-Plus from companies like PYB or Mag-1. I would be all over those. https://mag1.com/products/passenger-car-motor-oil/monograde-motor-oil/mag-1-sae-30-motor-oil/
Quote
MAG 1 SAE30 INDUSTRY/OEM SPECIFICATIONS API SN Approved API SN Plus Approved API SJ, SH, SG, SF Meets Requirements API SL Meets Requirements API SM Meets Requirements TYPICAL PROPERTIES Boron, wt. % ASTM D5185 0.018 Calcium, wt. % ASTM D5185 0.132 Color ASTM D1500 3 Flash Point °C ASTM D92 210 Flash Point °F ASTM D92 410 Foam Seq. III (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0 Foam Seq. II (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0 Foam Seq. I (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0 Gravity, °API ASTM D287 29.85 High Temperature Foaming, static foam ASTM D6082 (Opt A) 10/0 High Temperature / High Shear Vis at 150°C, cP ASTM D5481 3.38 Magnesium, wt. % ASTM D5185 0.043 Molybdenum, wt. % ASTM D5185 0.004 Nitrogen, wt. % ASTM D4629 0.086 Noack Volatility, % loss ASTM D6375 6.1 Phosphorus, wt. % ASTM D5185 0.077 Pour Point °C (°F) ASTM D5950 -33°C (-27°F) Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.877 Sulfated Ash, wt. % ASTM D874 0.92 Sulfur, wt. % ASTM D4951 0.3 TBN, mgKOH/g ASTM D2896 7.0 Viscosity @ 100°C cSt ASTM D445 10.94 Viscosity @ 40°C cSt ASTM D445 87.96 Viscosity Index ASTM D2270 110 Zinc, wt. % ASTM D5185 0.085
For those that ask why, look at the figures above. You have a modern API SN-Plus oil with a modern Ca & Mg detergent package, with 180 ppm Boron, and 40 ppm Moly. The KV100 is 10.94 cSt, but the HTHS is a massive 3.38 cP, with a fantastic low Noack volatility of only 6.1% in a completely shear stable oil. That's why !!! Even the Pour Point of -33°C (-27°F) shows what a modern Group II can do for the cold performance. (But I would still keep application to above freezing. ) These ain't your grandpa's monogrades of yesterday.
 
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5,570
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New Zealand
Everyone uses 20W-50 in the old aircooled BMW motorcycles because it covers all temp ranges you are likely to use it in. But they also recommend straight 30 between zero and 30 C, right in my temp range. So I ran it last year, and now am back on a synth 20W-50, and can compare oil temps. Sumps temps were cooler with the 30, so even though I was running it at over max recommended ambient temps, the oil was cooler than the 20W-50. Also, nothing came out of my road tube breather...and had to fit a filter with 20W-50 because it was putting a bit of oil out. I'd happily run 30 in anything in my temp zone. It's just a bit hard to find here, apart from lawnmower stuff. Our only boutique blender makes a nice diesel and trans rated 30 I use, but I have to order it in.
 

SR5

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Down Under
Originally Posted by tundraotto
- and a TBN of 7.0 Naah. What is the advantage? To pay more?
I hear you, but to be fair it's the same TBN as MAG 1 10W30 full synthetic https://mag1.com/products/passenger...l/mag-1-full-synthetic-10w-30-motor-oil/ Which is the same as SuperTech 10W30 full synthetic, and that did fine in this 6000 mile UOA (2019) from a 2008 KIA Sportage with a finishing TBN of 2.7 https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5277530/1
Quote
MAG 1 FULL SYNTHETIC 10W-30 INDUSTRY/OEM SPECIFICATIONS API SN Approved API SN Plus Approved ILSAC GF-5 Approved API SJ, SH, SG, SF Meets Requirements API SL Meets Requirements API SM Meets Requirements Chrysler MS-6395 Meets Requirements GM 4718M Meets Requirements GM 6094M Meets Requirements ILSAC GF-4 Meets Requirements TYPICAL PROPERTIES Boron, wt. % ASTM D5185 0.018 Calcium, wt. % ASTM D5185 0.132 Cold Cranking Simulator at (°C), cP ASTM D5293 3884 (-25) Color ASTM D1500 3 Flash Point °C ASTM D92 210 Flash Point °F ASTM D92 410 Foam Seq. III (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0 Foam Seq. II (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0 Foam Seq. I (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0 Gravity, °API ASTM D287 33.86 High Temperature Foaming, static foam ASTM D6082 (Opt A) 20/0 High Temperature / High Shear Vis at 100°C, cP ASTM D6616 7.17 High Temperature / High Shear Vis at 150°C, cP ASTM D5481 3.04 Magnesium, wt. % ASTM D5185 0.043 Molybdenum, wt. % ASTM D5185 0.004 Nitrogen, wt. % ASTM D4629 0.086 Noack Volatility, % loss ASTM D6375 8.2 Phosphorus, wt. % ASTM D5185 0.077 Pour Point °C (°F) ASTM D5950 -42°C (-44°F) Pumping Viscosity at (°C), cP ASTM D4684 13,900 (-30) Shear Stability, Final Viscosity in cSt ASTM D6278 8.99 Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.8557 Sulfated Ash, wt. % ASTM D874 0.92 Sulfur, wt. % ASTM D4951 0.3 TBN, mgKOH/g ASTM D2896 7.0 Viscosity @ 100°C cSt ASTM D445 10.14 Viscosity @ 40°C cSt ASTM D445 61.71 Viscosity Index ASTM D2270 151 Zinc, wt. % ASTM D5185 0.085
Notice how the add packages of Mag-1 SAE 30 and Mag-1 10W30 full synthetic look the same. That's because they probably are, as the package was probably developed as a matrix solution to multiple oils, as this is a more efficient development method. I would have no problems going 6000 miles on Mag-1 SAE 30, and maybe more with a UOA along the way. To what advantage ? Higher HTHS, Lower Noack and 100% shear stable as it's the polymer VII that shears, not the base oil.
 

4WD

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13,527
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Texas
I bought two quarts of ST SAE HD30. It is SN Plus. The next Walmart (12 miles) had no mono 30 at all.
 
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CA
Thread starter
Originally Posted by SR5
[ To what advantage ? Higher HTHS, Lower Noack and 100% shear stable as it's the polymer VII that shears, not the base oil.
Just what I was looking for, thanks!
 

SR5

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Down Under
Originally Posted by danez_yoda
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, quite the opposite, it's the polymer VII that shears, not the base oil (synthetic or mineral), so a monograde with no VII should be 100% shear stable. Also now that nobody uses rubbish Group I base oils, I think much of the deposits comes from the VII itself. I would be very happy with a modern SN-Plus rated Group II or Group II+ monograde. In fact that Delo 15W-30 Heavy Duty was probably just that (or close to it) under another name.
 
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Western S.C.
Originally Posted by chainblu
I don't anymore, but years ago I ran 30wt in many of my vehicles. No problems.
Likewise, in the summer in New Jersey in my Subaru.
 
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2,960
Location
Western S.C.
Originally Posted by chainblu
I don't anymore, but years ago I ran 30wt in many of my vehicles. No problems.
Likewise, in the summer in New Jersey in my Subaru.
 
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1,674
Location
WA
I was under impression that straight grade oils don't have all the necessary add packs suitable for modern engines. One reason being not much market for it. also tractors may not need any fancy add packs ... In general and without extensive research, I would stay away from odd products with limited market. Odd (or limited market and not customary) in this case would be using straight grade for autos.
 
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1,674
Location
WA
By extensive research I mean some research beyond someone on a website saying it's ok to put a lawnmower oil in my car. They maybe ok and not just for lawnmowers or tractors but since I'm not used to it and/or never seen or heard anyone I know using it, I would be cautious. assuming above all that the grade (e.g. 30) is suitable for the given ambient temperature. Maybe summer time or if you live in TX? lol Btw I'm not against it and not too long ago, I researched and posted about using a straight 20 assuming it would have no vii ... but it went off my radar because i didn't want to risk it without any additional research.
 
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1,674
Location
WA
Originally Posted by Triple_Se7en
If someone held a gun to my head and demanded I use a single-grade oil in both my Korean models, I would use straight 20W.
LOL good idea if you are 1/2 hr N.E Of Detroit . straight 30 may be dicey during the winter time! btw, I've heard there are a lot of guns over there shocked2 maybe even more than 0W oils.
 
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502
Location
South Wales, UK
A straight 30 weight should be good down to freezing. I'd love to use one in my Mondeo & Defender but finding one with somewhat up-to-date API approvals isn't possible here in the UK.
 
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611
Location
US
Originally Posted by ARB1977
My Tacoma uses 5W30 and my wife's Pilot uses 0W20 in the Texas heat.
+1
 
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