Quote:
Originally Posted by SeanWRT
OP, thank you for the insight.
Can you confirm my understanding of your message that 0w30 can be thinner than 5w30 even at its operating temperature despite of them both rated as 30, which leads to 1)less protection, 2) excessive oil consumption and 3) blow-by?
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In theory 0W-30 and 5W-30 should be the same at operating temperature however. However, I worry that while both might meet the same 30W standard one might be still be on the higher end of the 30W standard and one lower; or, they both might meet the standard but one break down earlier and drop below the 30W standard as the Redline man said in the video.
Also, while both meet the minimum 30W viscocity it takes quite a bit of time for our cars to get up to operating temperature. Before they achieve the operating temperature, the OW oil is thinner. During this time you could be increasing consumption and blow-by.
If you live in cold climates the benefits of 0W probably offset the negatives of a little more consumption and/or blow-by but for me in San Diego where it never gets cold, there is no real benefit to 0W and only the possible dowside of blow-by before it achieves operating temperature.
Now as a matter of strictly conjecture and opinion, I do think the 0W is probably thinner overall than a 5W-30 or 10W-30 but I would defer to the oil specialists on that.
Quote:
Originally Posted by SeanWRT
OP, thank you for the insight.
If that's true, isn't 0w40 a better option (than 5w30) in both world?
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Again, solely on gutt and conjecture, I would err on the side of 0W-40 because you get more protection at operating temperature. So Yes, 0-40 is a better option in m opinion but, there is still a period of time where you still have 0W oil before you are up to temperature where you could have the extra consumption and possibly blow-by.
That is really what I am trying to say. 0W weights are there to increase mileage and to work in cold climates. It's a great jack-of-all-trades oil that it's hard to go wrongbut with a healthy does of skepticism look at how you drive.
If you live in a hot climate and drive hard during hot days, then 0W-40 seems like the smarter choice. For me, I went with 5W-40 because it gets warm here year round and 0W only brings some possible downsides and little upside for me.
Watch the Redline video, I was surprised about the part where they find some 30W oils that perform below 30W at some temperature and I believe that temperature was 10-20 degrees celcius below what my 1M registers at operating temperature.
I hope it makes sense.
Thank you.