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Depends on which grade you use. The Mobil/Exxon and Shell premium fuels supposedly do a better job than their 87 fuels.

I use it regularly, great stuff.

So, where are we on this issue? It's been a while and I haven't seen too many complaints lately on this board anyway about CD. Does everyone think Mazda actually beat all the problems on CD or are there still issues? Mazda Cylinder Deactivation Problems: What Every Owner Should Know

No, nutball drivers should stay the hell off the road....

And who "verifies" it as structural or superficial? There's not a responsible tire shop that's going to say it's ok. Been there, done that.

Cracking inside or outside is not safe. It's a sign of a deteriorating tire. But, hey, to each his own. It's not something I feel safe having family members in out on the freeway.

At that age they're not safe, tend to dry rot faster. That's why you need to check that date code when you buy used tires.

Yes, in case you don't know it's actually one piece, plug attached to the patch. The bead has to be broken and you have to scuff the inside of the tire with a tool so there's better adhesion.

A few years ago I was looking for new snow tires and the garage I go to for tires only said they had a good deal on a set of tires they had in the back. The date code showed they were manufactured 6 years prior, yeah they were "new" still having the original manufacturers stickers on but too old...

Why do you want to go to a 40 weight?

Patch with the plug is the proper and best way to go. Cracking indicates dry rot, get rid of them. Also, when you buy a "new" set of tires check the date code. Anything older than 7 years is a no-go.

Consumption can be caused by gummed up rings as seen on engines with high OCI, fuel dilution, shear down, etc.. The Valvoline Protect and Restore seems to solve this by its incredible cleaning abilities, just one example of a good oil solving a simple consumption issue. I think 5w-30 is way more...

Yeah, that's another big thing with these engines, particularly with DI, fuel dilution and oil shear down. Another reason why I stick with the 5w-30 boutique oils.

different country, different set of circumstances, understandable.

oops

When I switched to 5w-30 I started with Castrol, damn good oil, and yes valve train got considerably quieter.

BP claims on their website that their blend exceeds Top Tier minimum standards. https://www.bp.com/en_us/united-states/home/products-and-services/fuels.html#accordion_what-does-invigorate-do

..."no one knows what an EVAP system is".. Seriously?? Find a new garage. Sounds like a bad purge solenoid or vent valve which is why you smell gas vapors especially if there's so much pressure build up.

Engine is still CDA?

Trigger words for me are "unlimited warranty". To me that means not-as-good-as. Kind of like Hyundai with their 10 year drive train warranty.