what are the differences with the all popular castrol gtx vs. the not so popular shell.
are there any?if so, what are they?

 

wow thread revival much???? Search around and u will find all the answers you need about oil.

 

there are wayyyyy too many threads about these discussions....i just want no the bottom line difference between the shell and the castrol....anybody?

the reason for need of this info is that the shell is only 10$ for 5 quarts...vs, the 8 or sum for 1 of castrol...in times or crisis i ask what is the difference?

 

I kind of agree. You can't always find the exact answer you're looking for even though there's probably 50 threads on oil. The OPs question was answered anyway, so no harm done.

While I'm posting, I might as well ask if 5w20 Castrol Syntec Blend is ok to use? I've used it ever since I bought the 8. Thanks in advance guys.

 

ya exactly...o ya....while on topic..after reading mroe andmore on the oil everyone is using..i think i have come to the conclusion that im going to just say f-it better be safe than sorry and get the castrol gtx 5w-30. because i read that5w-30 is better in hot climates....so cal tends to flucuate withweather..althought it raining rite now. and not syntec just cuz havent got much results from people saying any big differences for the price...

 

That's already the case if you use Mazda's US recommended 5w20.

Brilliant post - thanks.

Something to watch out for in oil labeling is advice from dimbulb outfits like Consumers Union. They lobby for the public to look for the "For gasoline engines" label, rather than the API service level. Don't have an oil bottle in front of me, so I don't know off hand if they and their ilk were successful in pushing the API Service label to the back. They don't seem to realize that service level grades do improve with time, and the newer cars need that improvement.

Ken