Originally Posted by bulwnkl
I wouldn't waste my money on the ‘euro' formula oils. They're no better resisting fuel or its effects. Remember the Audi A8(?) work some years ago; it demonstrated the mediocrity of the euro formulae with complete clarity. Renewable Lubes' product was the only thing that was significantly better than other options.
I think the reason people use the Euro 30W oils in these newer TGDI engines is that, compared to the 0W-20 oil they call for, one of the higher HTHS Euro oils will still end up with higher viscosity at the end of an OCI in one of these fuel diluters.
My fiancée has a 2018 Civic 1.5T, and that's what I would use if hers wasn't under warranty. She just feels more comfortable using the grade of oil that the book calls for, while she's still under factory warranty. And I'm saving all receipts, and even taking pictures of the bottles with date stamp when I do her oil changes, just in case. I know Honda has extended the factory powertrain warranty mileage to unlimited miles (it can still time out after 5 years) in certain engine components that have been commonly affected in the cars that have been deemed to have been damaged by the severe fuel dilution.
As it stands now, I have enough Valvoline Modern Engine and M1 Annual Performance 0W-20 that I snagged at the Auto Zone clearance for $2/quart, to do her oil changes at 5000-mile intervals for the next 2.5 years, if she continues at the 20,000 miles per year that she put on it in her first year owning it.
So it'll be an experiment. I plan on getting some UOAs and probably VOAs as well on those oils.
I hope she doesn't have an issue with her 1.5T, and I really don't expect her to, because we change the oil every 5K with good quality synthetic, keep an eye on the level, use premium name-brand fuel, and deliberately take it out for longer drives to fight fuel buildup in the oil.
If we do have a problem, oh well, it's under warranty for 4 more years, and I document all maintenance to a "T".