Originally Posted By: jayg
No offense but there is a big difference from the engines in your signature and a high strung turbocharged, cast aluminum direct inject 1.6.
That big difference applies to the design of the engine as well. Do you think the engineers would have the same bearing/oiling system for a NA engine and a GTDI engine?
Originally Posted By: KL31
You could use a 0W40 no problem. The DI engine will dilute that sh!t down to a low 30 weight in no time.
Has anyone seen a UOA where a DI engine didn't shear/fuel dilute the oil down? I'd try whatever oil they used. Some oils will resist fuel+turbo heat far better than others.
The engineers would have seen this same behavior in testing. If 20wt shearing down was an issue they would have seen it in testing and spec'd a higher weight oil.
Originally Posted By: jayg
Originally Posted By: bvance554
The people who designed, engineered, built the car told me to use this, but I know better and I want to use this. Is that what you're saying?
The people who design, engineer and build the cars spec wildly different oils for the same model depending on region its being sold.
What's your answer for that? The OP makes a valid question if the car with the same engine is specced for a different grade by the same engineers just because it's sold in a different market.
If engineers recommend I run 15w50 in the UAE but 5w30 in Death Valley, why is that when the climates are similar? What's the difference? The US has to make CAFE standards and UAE doesn't. What protects better? I'd reckon it would where the engineer is able to have free reign and not be limited by standards trying to eek out fractions of MPG from every single make and model.
Will 5w20 work? Sure. Is it the best for that engine with high temps ,high revs, and DI that can really trash oil pretty quickly? Well, that's the question and that's why we are talking about it.
There are many reasons to spec different oils for the same engine depending on the region. Engineering virtually never has free reign so a lot is based on marketing or supply considerations in different areas. You also have to factor in the varying quality of fuels, air, expected filtration, etc. I can almost guarantee the engine was trashed at high temps, high revs, and had the oil "trashed" during the testing phase. It is unlikely that we will see any conditions on the street that were not accounted for either in dyno testing or real-world driving.
