I just use vegetable oil.

 

That's a matter of opinion. Show me conclusive data that shows that it's "worth it". Until then, I will continue to use Castrol GTX 5w20 from WalMart...$1.96 a quart.

 

Speaking of, I saw a Trucks episode about making your own biodiesel.....which makes me wish I had a diesel truck just because of how cool it is!

Plus it comes out to 70 cents a gallon! (That doesn't factor in the cost of the equipment needed to make it though...)

 

I read a post here or at FTW a few years ago on Castrol Syntech. Apparantly it is not a true synthetic oil. It is a highly refined conventional oil. One of the other oil companies filed a lawsuit against them but the courts ruled that because of the process that Castrol uses, they can legally sell it as a synthetic. I don't know if this is true or just internet BS, but I did start to notice that in Castrol's comercials they compare it to conventional oils and not synthetic oils.

 

I have to laugh at this. There's guys on this sight that worry about what kind of sticker to put on the back window.

Among all the things that we worry about with our trucks, I think oil is one of the most important.

Why not just use Pennzoil, or Joes motor oil? Would you trust anything but the best your money can afford when it comes to the longevity of our trucks.

Mobil 1 for me. If I can afford the gas, I can afford the a few bucks for the best oil.

 

Im running 5w30 Castrol Syntec right now, should I be okay?

 

Oils thicker than what's recommended and/or extended drain intervals may cause problems with the VCT system further on down the road. Variable cam timing is highly dependent on oil pressure and quality.

 

So basically the next time I change my oil, get 5w20 and I should be alright?

 

That's what I'd do. You'll probably be alright on 5W30, but 5W20 is what's recommended and contrary to popular belief, it's not recommended exclusively to eek out every mile per gallon Ford can.

People who run oils that are significantly thicker than 5W20 or 5W30 (like 10W30, 10W40, or (ack), 20W50) may have problems further on down the road, or they may run alright forever. The way I figure, why chance it? Ford semi-synthetic 5W20 is supposed to be pretty reputable stuff and way surpasses OE requirements. That's what I've ran in my truck since day one. I'm considering getting an oil analysis done, if I can get someone who's ran another brand since day one and we'll compare notes to see who's really running a superior (if any) oil.

 

When I change my oil I use Royal Purple 5w-30, somewhat expensive, just below redline oil. I am putting down 268hp/330tq so it might have something to do with those numbers. I am actually getting horrible gas mileage and it's been worse ever since I had my tuner and changed to this oil. I think I'll change oils next time.

 

Mobil 1 5W20 in my truck. Have you ever seen the difference between the inside of a engine which has run synthetic oil, and one that has used dino oil?
I have, and therefore I run synthetic.

 

I will use Mobil 1,

After 2 trade-ins with high mileage of 85K+, my brother the used car prep guy for the dealer inspected them. He took off the valve covers for curiosity because he knew I ran Mobil 1. Told me it was the cleanest he's ever seen in a high mileage vehicle. After the first trade-in he started running Mobil 1. He has access to less expensive oil but he thought it was worth it. After the second trade-in I did. He said he was completely sold on it.

I have no experience with Castrol except a drag racing buddy that didn't really like it much under extreme conditions but then again they weren't high mileage engines either.

To each is own but I will stick with what I KNOW works for me.

 

tomtheoilguy.com (I think this is the url) did an in-depth test and review of all of the major brands of synthetic oils. Without revealing the results of the test, all of the motor oil companies maintained their own oil stocks, with the exception of Castrol. Apparently Castrol would buy oil stock from the spot market, using many different oil distributors. This made the Castrol product vary from lot-to-lot. So, according to Tom the Oil Guy, one quart of Castrol may not be as good as another.

 

Valvoline 5W30 Synthetic oil for me. No problems yet.

 

Motorcraft is fine, but if you wanna pay more for a little better, Mobil1. Anything else isn't worth it IMO.