Carlostrece
$100 Site Donor 2025
I didn't think any company still offered conventional motor oil, but fun fact.. Tonight I noticed on Pennzoil website that Pennzoil still offers a conventional oil in a few viscosities.
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?The good ol’ yellow labeled bottle.
There’s a few other companies that still make conventional oil like Castrol, Chevron, Shell, and Valvoline to name a few. It’s becoming harder and harder to find.
Sucks for people like Mazda rotary owners who have to use conventional.
You're asking why rotary engines need to use conventional motor oil and not synthetic. At first that seems counter intuitive because rotary engines often have high rpm.I know rotary’s are a world all unto their own and they are basically sci-fi to me but why do they require conventional?
ISOSYN base stocks are what are known as Group II+. Somewhere close to Group III but not quite. Still pretty good stuff, though.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?
I gave Chevron conventional with ISOSYN 5w30 a chance, but it went through my old HM car like poo through a goose. Way to much oil burning, leaking, and oil loss. My car behaved like it was all clapped out, even though it's actually a good car.ISOSYN base stocks are what are known as Group II+. Somewhere close to Group III but not quite. Still pretty good stuff, though.
Remember marketing loves "good, better, best." Why do we still have midgrade gasoline when virtually no modern cars take it? Because people buy it.Here are pictures of two different Pennzoil products. The first one is 5w30 with no other designation on whether is conventional or not. It’s rated as SP.
The second product is also 5w30 but is marked as synthetic blend. It’s also rated as SP.
There were discussions earlier on whether “ conventional” oil can meet SP specs without containing some semi-synthetic oil. Both photos were taken on the same day.
A conventional HM oil should be the ultimate leak stopper because it'd have the advantage of conventional oil does less leaking, and HM additives also reduce leaks. So with a conventional HM you're getting both advantages for reducing leaks, oil burning, and blowby.I contacted Pennzoil and confirmed that the 10w-30 and 10W-30HM are conventional. Also the 10w-40. PYB 10w-30HM dries up a RMS seep in the Jeep. Supertech FS 10W-30HM made the seep come back in 1000 miles. Dumped the ST at 1500 and put the Pennzoil back in, almost dried up again.
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?If people pay extra for "syn blend" when the conventional can be considered a syn blend, why would Pennzoil disavow this opportunity?
Of course posting 9 shows a 5w30 synthetic blend and a 5w30 with nothing noted.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?