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I didn't know synthetic oil had anything to do with crude petroleum oil or natural gas until recently. I thought it was completely different the way that say NutraSweet has nothing to do with sugar the way it is made.

I was just commenting on what the other gentleman said about Smartstream. Look above. I guess I took what he said at face value.

Are your OCI a bit high for D.I. despite whatever the manufacturer recommends? It might be a good idea to have oil analysis done by a lab. I live in the high desert. In the winter it gets cold at night but with low humidity. Is oil described as "conventional" less than 50% natural...

It is odd Hyundai would make a questionable design like the Smartstream after the Theta II issues. I'd double check to see what weight oil you can use without voiding the Toyota warranty. Those oil weights the manual pushes is light.

I don't know. I'd have to dig it out and look.

It's that bad?

If I maintain it well, any opinions on how many miles I can get out of the engine before it goes kaputz?

It is under warranty so I don't think I can use anything heavier than 5w30.

Maybe 50/50 city and highway. Maybe 2000 miles driven within 4 months. 2019 Kia Rio with 1.6L direct injection. A gentleman above was doing 6K OCI on his Kia. He said the oil was in bad shape so he switched to 3K OCI. @ARCOgraphite

My car isn't a turbo and doesn't have an oil temp gauge, so I don't know how hot the oil is getting. I don't know if turbos typically have oil temp gauges.

A part of me wonders is 3K OCI with conventional is better than 5K with synthetic because it gets dirt, grime, carbon, and gas by blow by out of the engine sooner.

What's your opinion to the question if Valvoline Quick Change was used?

If a person has their oil changed at Valvoline Quick Change or Jiffy Lube, is it better for the vehicle to have the oil changed every 5K miles using full synthetic or every 3K miles using conventional and synthetic blend oil? The car in question has direct injection and is driven in a mix of...

It can't hurt to have oil analysis done. I don't know what the manual for your vehicles say, but my '19 Kia says 7500/yearly changes for normal use, or 3750/6 months for "severe" use. I think Hyundai/Kia regard the vast majority of us to be driving under "severe" use. I acquired the impression...

Is blend better for cleaning the engine internals? Also, is blend better for engine seals?

Exactly. Before the Renault alliance, Nissan was like Toyota, or very close to it.

Thanks everyone.

Correct.

Full synthetic is substantially more expensive at Jiffy Lube and Valvoline quick change (forgot exact title). My car (Kia) requires 6 month (severe schedule) OCIs to maintain warranty. I usually drive less than 1000 miles in 6 months. As an aside, if you look into the owners manual, the vast...

Back in the 1980s General Motors came out with a fuel injection system called Cross-fire Fuel Injection. It acquired a reputation for being unreliable. Someone nicknamed it Cease-fire Fuel Injection.