2011 Buick Regal 2.4 NA, 4200 mi., AC Delco 5W-30

[Benzadmiral]

I'm amazed -- I only mailed this sample on Monday! Have a look:

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They say my sample approximates to oil they've seen go 6300 miles. So I guess 5000-5500 might not be out of the question!

 

[mrsilv04]

I'd run this change to 55,000 miles, change the oil, and then change it on the 0's and 5's... 60,000, 65,000, 70,000...

Makes it easy to remember. It's exactly what I do on the Town and Country.

What was the OLM at when you drained it at 4200 miles... or did you just take a sample?

 

[3800Series]

What oil did you use? 5k isn't a ton of miles on oils.

I typically go 5k on anything conventional. Iv just recently got a care that doesn't leak so I can't speak for synthetics.

Anyways most my family gos 6-7k on conventional (I personally wouldn't do it) but I guess its cheaper to do extended and just use 1/4th bottle of flush every other change to help keep it clean.

 

[Benzadmiral]

The oil was the dealer-supplied AC Delco dexos1 semi-synth -- the 1st of the 4 CPO changes that came with the car. The OLM was at about 40%. After everything I've read here about DI engines and fuel dilution, I was a little worried, but it looks like I didn't need to be. Perhaps I can stay with a dexos1 semi-synth for 5K intervals. And maybe a Fram Ultra filter, changed every other OC?

This OCI included a 2000-mile highway run out to Amarillo, TX, and back, so this wasn't my usual driving pattern. Then again, that trip was in late May, back when the oil was fresh; it's had about 2200 miles of my usual 70% city driving since then.

As for the sodium issue Blackstone mentions, I don't really know what oils the previous owner used. The car had a dealer change before I bought it, and this change was the first on my watch. The car has the same oil in it now, after my 2nd CPO change.