Any of you guy`s use a conventional oil,that really seems to perform well in your RX? I.E Pennzoil,Quakerstate etc.I`m getting kind of tired of such expensive oil changes.Plus Mr.RX is getting older now,and I`m not sure just how much longer I`m going to keep it.

 

In my opinion Castrol GTX is a superior oil...for me pennzoil was always a cheap brand

 

What are you using in yours?

 

Castrol GTX summer Castrol Syntec winter ... it goes down to 30- 40 below zero C and the synthetic always starts

 

Can you tell a big difference between the two? or is it about the same? I.E power etc.

 

Same for power but i am not a speeder.

 

I may just go back to Formula Shell,I like SOPUS products.

 

Wow... -40C = -40F. You must not be in California. Alaska maybe?

 

Engines have been running on conventional oil for billions of miles. The key is to replace it regularly.

WithOUT scientific data at hand, I would only recommend to stay with the same make and try not to switch from synthetic to conventional frequently. I would suggest going to mix formulation to ease the shock and back off if you see leaks.

Salim

 

Good advice Salim.

 

I might burn a bit more oil on synthetic due to it sneaking by . Not so worried about leaks.

Why would the improvement in lubricant qualities develop leaks?

Here is the list of myths from Castrol's site http://www.castrol.com/castrol/gener...tentId=7017050

It just flows so much better at -40
Northern Ontario Canada

 

I agree with V4tuna- I have used Castrol for many many years and I personally don't think there's a finer dino oil on the market. Since it is the only Castrol I have used I can't speak for the others, but I have used other brands in the past and I would not use anything but Castrol. My '04 F-150 uses Motorcraft Semi only because I can buy it so cheap at Wally World, but all my past F-150's have used Castrol from new with excellent results.