Pennzoil conventional oil still available

[cmarshall78]

My local Ace Hardware has it on the shelf

 

[ripcord]

That doesn’t explain why 10W-30 and 10W-40 don’t say syn blend on the bottle but 5W-30 does. Might it be true?

Probably because they can make a heavier grade oil into a 10w-30 from group II stocks without using too much viscosity modifier. For the 5w-30 grade they probably need to add some more thermally stable Group III base stocks to get the viscosity index needed.

 

[wemay]

Home Depot has it

 

[AZjeff]

Of course posting 9 shows a 5w30 synthetic blend and a 5w30 with nothing noted.

Must have something to do with the French on the jug. 5w-30 all says syn blend here.

Home depot is where I buy the 10w-30 hm conventional and the 5w-30 says syn blend in store and on line.

 

[Carlostrece]

Probably because they can make a heavier grade oil into a 10w-30 from group II stocks without using too much viscosity modifier. For the 5w-30 grade they probably need to add some more thermally stable Group III base stocks to get the viscosity index needed.

That's one of the reasons why I use 5w30 HM blend instead of 10w30 HM conventional. I assume the 5w30 HM blend has better based oils, plus likely less wear at cold start.

I used 5w30 Maxlife Syn for a decade. It leaked a small puddle on concrete after each drive.

I switched to 5w30 Maxlife Blend (red bottle). Then it leaked only a few drops after each drive.

Then I had my valve cover gasket replaced. No more leak.

My car isn't an oil burner and only had a minor leak using Maxlife 5w30 HM blend (red bottle). Leak now fixed completely be replacing valve cover gasket.

If my car was an oil burner or a severe leaker, then I'd use a 10w30 HM conventional oil. Likely Pennzoil or Quaker State. Maybe Valvoline. And thicker the better (within grade) @ KV100.

As a last resort, I'd go up a grade in a HM oil. Ideally a conventional. 2nd choice a blend.

 

[RcClockman]

Is Chevron 20w-50 A Conventional or Sem-syn? Its SN rated....

 

[ripcord]

Is Chevron 20w-50 A Conventional or Sem-syn? Its SN rated....

I assume you're asking about Chevron Supreme? Here is the spec sheet.

https://cglapps.chevron.com/sdspds/PDSDetailPage.aspx?docDataId=533194

The spec sheet shows that 20w-50 has a viscosity index of just 126 so it is likely to be all or mostly all Group II or Group II+ base stocks. If there is any Group III included it will be a small fraction of the total.

 

[4WD]

The only Chevron oil I've seen in last 20 years said ISOSYN on the bottle, which an Oreilly store manager told me is Chevron's brand trademark name for synthetic blend. Am I missing something?

That’s on the ESI gear oil and HDEO as well …