Quote:
Originally Posted by DRACHENV6
Everyone has their logic. Here is mine. I based my selection off Mobil 1 Extended performance because it is readily available, reliable, and relatively cheap. Plus I believe that Mobil/Exxon has more money than any other company out there to develop lube.
If anyone has information about certifications and industry approvals for other brands, it would be nice to see for comparison's sake.
This PDF is gold
1. The Mobil 1 EP line only comes in 5w20, 5w30, and 10w30 flavors because these are the only viscosities that are stable/resist breakdown under a stable load. 0w does not last long enough to receive the proper industry approvals
2. I would consider these three viscosities to be within "spec."
3. protection: 10w30 > 5w30 > 5w20. Why? Look at the ACEA and industry certifications. Google them if you must. They relate to breakdown over time and under load. 10w30 is factory spec for supras.
4. gas mileage: obviously 5w20 will be better than the others due to a lower viscocity.
I would sacrifice mpg and run 5w30 in mine, 10w30 if reasonably boosted, and 5w20 at the bare minimum... |
5W-20 is usually even more stable than 5W-30 since more viscosity modifiers are used to create the 5W-30 and many 5W-30's shear to a 20 grade anyway. Also, notice the difference in ZDDP levels between M1 0W-20 and 5W-20 in Mobil1's chart (although manufacturers do increase other anti-wear additives when ZDDP is reduced).
The thing about some of other specifications, like ACEA A1/B1 or even some of the manufacturers specs (like dexos), is that some oils are actually submitted to these bodies and receive formal approvals, while some oils claim to meet these specs but are not actually submitted for certification. You need to look very carefully at language such as "exceeds the requirements of" or "recommended for". Not that it really matters at the end of the day for most applications on this forum.
More ACEA info here:
http://www.acea.be/images/uploads/fi..._Sequences.pdf
To get an
idea of the differences in oil specs (API, ACEA, and manufacturers specs), this is a neat tool:
http://www.lubrizol.com/EngineOilAdd...l/default.html
Keeping in mind the disclaimer listed on the site:
Quote:
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The performance charts are not a literal translation of a performance specification and should not be used as a replacement for evaluating engine oil performance in accordance with the relevant vehicle manufacturer’s requirements.
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-Dennis