Im sure this not a new topic but I am wondering what type of oil everyone uses and why?

Thanks, Joe

 

Castrol 10w 30. Just out of habit I guess

 

I run Royal Purple in both of my Mustangs because it is the best synthetic oil you can buy, and it protects my engines better than any dino oil.

 

I was using 10w30 Penzoil. But I be using Royal Purple in the rebuilt engine...

 

Not to start a flame war here but unless you live in the extreme north where you need the cold flowability of synthetic or in the very hot summers of the south and you sit in Hwy. 17 S traffic in Charleston, SC for hours at a time you don't need to spend the money for ANY synthetic.
To my knowledge there are NO fully documented, one owner cars with 1,000,000+ miles on them that were running anything other that Castrol GTX. My cast-iron Sportster XLCH...run in traffic in Charleston, SC from 1977 until 1987 when we moved had nothing but GTX 20-50 in the tank from 18,000 miles. Had to do a top-end then due to an exhaust valve sticking and Warner Riley at Lakeshore H-D advised me to run GTX from then on. 108,000 miles later and the bike has not stuck another valve nor has it required another top-end rebuild.
I also know of a BMW R-80RT with well over 350,000 1-owner miles and no rebuilds and he runs nothing but 20-50 GTX.
The MAIN reason Mobil-1 is recommended in hi-po factory motors is based on the VERY extreme possibility that the owner will overheat the oil playing 'ronnie-roadracer'. A GM serrvice rep told me they used it in 5-30 because it gave about .2-.3 mpg and that saved them millions in r&d.
Don't waste your money on it.

 

Ive been running 10w40 castrol for the past 2 years...

 

10w40 dino on everything other than my 06 which gets 5-20 full syn due to variable cam timing which is based off oil pressure.

ive always been a pennzoil person, my dad always was too and growing up we never had any oil related engine problems so its just feels right to me.

 

You can catch Mobil 1 on sale at Wallyworld and do an oil change for 25 bucks.

 

Yeah, synthetic costs about 3 times more, but you can run it 5 times further than dino oil. There's nothing wrong with dino oil. Synthetic is just better no matter what temperature you are running. I spent a bit of time reading and researching and from a great deal of various sources I was convinced by all the tests that were performed.

 

I run Amsoil. Their written warranty helps, as does the extended drain intervals (1 year/25k miles). And, it's a lot less expensive than dino oil over the course of a year.