Originally Posted By: CATERHAM
Originally Posted By: Danh
Originally Posted By: CATERHAM
Originally Posted By: Danh
Toyota is not yet big on DI engines, at least not to the extent of Honda. Whether TGMO is optimized for DI engines (low Noack, etc.) is unknown.
2) TGMO has a good reputation here, but we can now see its composition from the MSDS on Mobil's website. Here's a big difference: TGMO is a classic Group III synthetic, with severely hydrotreated crude oil as a base. On the other hand, Mobil1 AFE 0w-20 is 30-40% PAO and Mobil1 EP 0w-20 is 60-70% PAO. I realize base oil isn't the whole package, but based on this I'm not sure TGMO quite deserves its status here. Compared to Mobil1 alternatives, at least.
Firstly the CoP made Honda 0W-20 is GP III based and I haven't heard of any deposit issues running a GF-5 0W-20 of any brand.
If one is concerned about intake tract deposits in DI engines it's not Noack one should be looking at but rather a low TEOST deposit score would be more relevant.
I haven't read anywhere that M1 EP 0W-20 is optimized for DI applications in fact I would think AFE would be a better choice between the two oils if the high TEOST deposit level of M1 EP 5W-30 is anything to go by.
I agree Mobil hasn't claimed either product is optimized for DI engines. But the Mobil1 EP 0w/20s seems pretty different from its 5w/30 counterpart, being 60-70% PAO compared to 20-30%. So the TEOST comparison may not be particularly useful. Of course, more disclosure by Mobil would make all this speculation unnecessary. But for my money if 0w-20 is what you need, Mobil1 EP sure seems like a good choice.
When it comes to low engine deposits PAO content has no inherent advantage over GP III based synthetics. In fact the oils with the lowest deposit levels I know of are GP III oils such as Castrol Edge.
While my 0W-20 preference for a 2014 Honda would be TGMO since it more closely approximates the viscosity of the OEM oil, particularly the Idemitsu made Honda oil sold in Canada, but if I had to choose between AFE and EP it would be AFE since it can easily handle the recommended OCI.
We're at a real disadvantage here inasmuch as:
1) The current generation of DI engines may or may not have an intake valve deposit issue. Or some engines may and some may not. Or driving conditions may make a difference. Or maybe not.
2) There doesn't seem to be anything definitive from auto or oil manufacturers regarding how best to avoid DI engine pitfalls. Neither is saying if TEOST or Noack is important, or which one is more important. In fact, as Ford's specs for its DI/turbo engines include conventionals, neither value may be important for Fords. German manufacturers may have a different view or may be dealing with a different set of problems.
So, we consumers are left pretty much to our own devices. I choose to focus on Noack as it makes sense to me. If I'm right about Noack, PAO or GTL-based oils should be preferable, and some manufacturers actually publish these specs. If TEOST is the answer, well, good luck finding an independent comparison of values. If it doesn't matter, no harm done with either approach.