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10K miles OCI in GDI engine is most def asking for trouble. Even with PP I don't go over 5K miles in MPI and 4K miles in GDI.

There is oil / gas dilution and add pack depletion to name just two.
If something can be done it doesn't always mean it should be done.
You base that on what data? I don't know if I'd go 10k miles, but 7.5k is probably perfectly reasonable and I've yet to see any troublesome analysis reports here or on BITOG that would leave me to believe otherwise.

Cheers!
 

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No it is not. I easily get 10K on Castrol edge 0W30 european formula and I have the oil analysis from Blackstone labs to prove it.

https://www.blackstone-labs.com

pull a sample send it and read the data you tell them the car you have the oil you are using and how well it's doing. If the oil and it's additives are not breaking down then it is just as good as the day you put it in the hole. :)
I too used Castrol but in 0w-40 and thou I find it's an excellent oil I think 5w-30 is a better choice for my 2 cars at my location but not Castrol in that weight but Pennzoil Platinum or Ultra Plat.
I also think A5/B5 is a better oil than A3/B4 - https://online.lubrizol.com/relperftool/pc.html
The main reason I change early is I see thickening at hose OCI levels while mind you I never ran UOA. I see thicker fractions on bottom of drain pan and just don't want to run oil longer so it doesn't sludge up engines. Yes, I saw it with Penn Plan on many oil changes and thus reduced OCI. I only do 5-6 oil changes a year on both cars combined.
 

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I'm confused as to why you seem to be guessing how best to protect the engine. What does your US manual say? In Europe, the recommended service interval for oil changes is 12 months /10 000 miles unless driven predominantly in severe conditions.

The recommended oil is Total Quartz. But any 5W-30 conforming to ACEA A5/B5 is ok. I believe that the Total is fully synthetic. NB the HTHS viscosity of ACEA A5/B5 is maintained at 2.9 to 3.5 mPa's between -30 and +120 deg c to maximise fuel economy whilst protecting the engine over the prolonged period.
 

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I'm confused as to why you seem to be guessing how best to protect the engine. What does your US manual say? In Europe, the recommended service interval for oil changes is 12 months /10 000 miles unless driven predominantly in severe conditions.

The recommended oil is Total Quartz. But any 5W-30 conforming to ACEA A5/B5 is ok. I believe that the Total is fully synthetic. NB the HTHS viscosity of ACEA A5/B5 is maintained at 2.9 to 3.5 mPa's between -30 and +120 deg c to maximise fuel economy whilst protecting the engine over the prolonged period.
US/Canada manuals call for SM or SN oil and usually in 5w-20 viscosity. No ACEA is mentioned.
We do seem to have two extremes here - people who want to stretch OCIs to max and beyond and people who stick with 'severe' maintenance schedule, most of Canada is in severe zone according to Kia.
Personally, I like to keep car happy and don't wait till something breaks or overdue. E.g. I replaced PCVs in both cars last night while there is no mention in the manual they needs to be replaced; Forte with 2X the miles of Sportage had very clean PCV as opposed to Sportage. It also helps when you get OEM PCV for $3.77 a piece.
 

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I'm confused as to why you seem to be guessing how best to protect the engine. What does your US manual say? In Europe, the recommended service interval for oil changes is 12 months /10 000 miles unless driven predominantly in severe conditions.

The recommended oil is Total Quartz. But any 5W-30 conforming to ACEA A5/B5 is ok. I believe that the Total is fully synthetic. NB the HTHS viscosity of ACEA A5/B5 is maintained at 2.9 to 3.5 mPa's between -30 and +120 deg c to maximise fuel economy whilst protecting the engine over the prolonged period.
European oil is better and is formulated to a higher standard than US blends thus it has better life.

Castrol Edge 0W30 european formula (A3/B3) is what I use and can easily go 10K on an interval with minimal degradation in additives and protective properties
 

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I replace PCVs every 30,000 miles. its a cheap yet critical part on the modern engine. If you test your engine oil and it reads well within the standards of performance why change it is my feeling. Indeed every time you open the cap and drain the sump you expose the engine to external contaminants so in a sense the less you open the car up the better off you are :)
 
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