I have my '04 silverado 5.3 filled with pennzoil ultra platinum. I do 70% hw driving and 20% city and the other 10% is wot pulls. Is a 5-6k interval too short for this oil? The olm usually zeros at about 6500-7000. I also do not trust the olm system because every oil is different and formulas change over time.
Pennzoil ultra platinum oci
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The only way to know for sure is with a UOA. Everything else is guess, or maybe an educated guess at best.
How does the oil look when you change it? If it just dark amber then you probably have more life in it.
Question is why worry about it. 7k changes are very reasonable inless you are looking to eak out every penny.
Question is why worry about it. 7k changes are very reasonable inless you are looking to eak out every penny.
That oil is higher quality and longer lasting than whatever oil GM used to develop their OLM calculations long before your truck was built. I see no reason to go the full cycle and test it to see how well it held up.
I used to do some long intervals (mileage and time) on the L76 in my G8 that were backed by decent UOA numbers. In that application there was an 8.8 quart sump, which surely helped.
UOA result
UOA result
Generally speaking, something like PUP certainly is an extended drain oil, despite it not being marketed as such. 5-6 would be conservative. If you do follow the OLM, you're certainly not going to be overdoing it by any stretch of the imagination.
you would trust ppl on the internet who read sentences of info but dont trust the olm which is recording your driving statistics?
olm is calibrated for the oil specified in the manual plus some extra buffer, because america.
so you should be able to take it to 0%.
the rest of the car will fall apart before the oil causes an issue.
olm is calibrated for the oil specified in the manual plus some extra buffer, because america.
so you should be able to take it to 0%.
the rest of the car will fall apart before the oil causes an issue.
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The GM OLM gives a fair assessment in my opinion. It certainly knows the difference between highway and city driving. It’s totally up to you to run it to 0 % or some other percentage. I tend to run it to 0 % or 7,000 miles whichever comes first, but for highway miles, 0 % occurs at 10,0000 miles on my 2008 6 liter Gen 4 Chev.
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Originally Posted By: Onug
That oil is higher quality and longer lasting than whatever oil GM used to develop their OLM calculations long before your truck was built. I see no reason to go the full cycle and test it to see how well it held up.
Correct.
You can go longer than what the OLM suggests with PUP. No worries at all.
Pull a sample and send it off at 10,000 and see what the results say.
Yes, I am serious.
That oil is higher quality and longer lasting than whatever oil GM used to develop their OLM calculations long before your truck was built. I see no reason to go the full cycle and test it to see how well it held up.
Correct.
You can go longer than what the OLM suggests with PUP. No worries at all.
Pull a sample and send it off at 10,000 and see what the results say.
Yes, I am serious.
4WD
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Originally Posted By: Onug
That oil is higher quality and longer lasting than whatever oil GM used to develop their OLM calculations long before your truck was built. I see no reason to go the full cycle and test it to see how well it held up.
What oil did GM use to develop that OLM algorithm?
That oil is higher quality and longer lasting than whatever oil GM used to develop their OLM calculations long before your truck was built. I see no reason to go the full cycle and test it to see how well it held up.
What oil did GM use to develop that OLM algorithm?
Patman
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Originally Posted By: 4WD
What oil did GM use to develop that OLM algorithm?
They would have most likely used whatever the factory fill on that engine was, and it was probably AC Delco 5w30 conventional at the time.
What oil did GM use to develop that OLM algorithm?
They would have most likely used whatever the factory fill on that engine was, and it was probably AC Delco 5w30 conventional at the time.
Originally Posted By: Garak
Generally speaking, something like PUP certainly is an extended drain oil, despite it not being marketed as such. 5-6 would be conservative. If you do follow the OLM, you're certainly not going to be overdoing it by any stretch of the imagination.
I totally agree. Trust the OLM. I think 7K or 1 year is reasonable. If you want to go longer get a UOA. I wouldn't be surprised if you could go 10K.
Generally speaking, something like PUP certainly is an extended drain oil, despite it not being marketed as such. 5-6 would be conservative. If you do follow the OLM, you're certainly not going to be overdoing it by any stretch of the imagination.
I totally agree. Trust the OLM. I think 7K or 1 year is reasonable. If you want to go longer get a UOA. I wouldn't be surprised if you could go 10K.
Triple_Se7en
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If you change your oil regularly, the only concern about oil change timing surrounds the notion that contamination of carbon, fuel, coolant ...etc.... is occurring. If so, then a shorter oil life-span will occur.
Originally Posted By: ka9mnx
I totally agree. Trust the OLM. I think 7K or 1 year is reasonable. If you want to go longer get a UOA. I wouldn't be surprised if you could go 10K.
Absolutely, 10,000 miles shouldn't be out of the question, and given the product and the application and the percentage of highway miles, 15,000 probably wouldn't be absurd. Of course, a UOA or two would be the best way to really tell. The OLM of that vintage would be based on, as Patman suggested, an ordinary 5w-30 conventional of the time, not a top tier synthetic A5/B5 like PUP.
I totally agree. Trust the OLM. I think 7K or 1 year is reasonable. If you want to go longer get a UOA. I wouldn't be surprised if you could go 10K.
Absolutely, 10,000 miles shouldn't be out of the question, and given the product and the application and the percentage of highway miles, 15,000 probably wouldn't be absurd. Of course, a UOA or two would be the best way to really tell. The OLM of that vintage would be based on, as Patman suggested, an ordinary 5w-30 conventional of the time, not a top tier synthetic A5/B5 like PUP.
More often won't cause damage so
Well, it can damage one's finances. If a vehicle's OLM is calibrated to roughly 7,000 miles given the OP's driving habits, and that's on conventional, I'm not sure what's to be gained by purchasing a company's top synthetic and maintaining that interval. It will certainly work, of course, but there are cheaper ways, too.
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