Anyone know what the HTHS of Castrol 0w40 is? 3.5 is listed, but read that wasn't accurate. Thanks
Castrol 0w40 HTHS?
- Thread starter FranklinJL
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A lot of oil manufacturers only list the minimum HTHS requirement for the viscosity / spec and not the actual HTHS viscosity of the oil.
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For sure, but it would be nice that they disclosed that information.
It’s not going to be significantly greater than 3.5, and the repeatability and reproducibility of the ASTM procedure can vary the result about 0.1 to 0.2. Solarent discussed that once on here. If you’re trying to fine-tune your HT/HS by 0.2 then I’d suggest using a higher grade or an oil that reports a higher value.
How is Porsche A40 approval marketing bull?
The minimum required HTHS to meet the API spec for a 0W, 5W, or 10W40 is 3.5. For a 15W40 and thicker, it is 3.7.
If you're looking for a 0W40 with a high HTHS, Mobil Delvac 1 ESP 0W40 has an HTHS of 4.1. It's a dual use gasoline/diesel oil with an SN rating. If it's for a GDI engine, an oil with an SP rating might be more appropriate though.
If you're looking for a 0W40 with a high HTHS, Mobil Delvac 1 ESP 0W40 has an HTHS of 4.1. It's a dual use gasoline/diesel oil with an SN rating. If it's for a GDI engine, an oil with an SP rating might be more appropriate though.
Valvoline loves doing it too, but they'll do it with things like the CCS or MRV, they'll list less than whatever the requirement is for the given W rating.Off the top of my head, Castrol is the only one I recall doing that
For Castrol, some of their product data sheets have HTHS, some don't.
The EDGE SUPERCAR 0W-40 A3/B4 does.
and this one, EDGE 0W-30 A3/B4
but not all, interesting that it isn't on all, although i didn't spend much time looking at all of them
The EDGE SUPERCAR 0W-40 A3/B4 does.
and this one, EDGE 0W-30 A3/B4
but not all, interesting that it isn't on all, although i didn't spend much time looking at all of them
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