Pennzoil conventional oil still available

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.
 
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.
 
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