Originally Posted by sjd78
I think synthetic oil is a waste of time and money. I dont trust any oil synthetic or dino and no matter what scientific tests have been done to go past 3000 miles. Cars have been running regular dino oil forever. Manufacturers still run dino oil in their cars. I just dont buy into spending the extra money and it will save the life of your engine. How many 4.0L engines have gone up to almost 300,000 miles on dino oil? Thats good enough for me!
Huh.... You might want to come out of the 1970's. Corvettes come with synthetic from the manufacturer and a most cadillacs as well. My CRD Liberty came with synthetic. In all these cases the manufacturer stipulates using synthetic only. I admit the cheap throw away cars are still on dino.
I don't think anyone here really cares if you want to use wesson vegatable oil in your crankcase. If you don't buy into the technology, cool. There are some good dino oils, I will admit to that. But it is like buying a good rifle versus a great rifle. Both will shoot, but you have to pay more to get a really good sub MOA rifle. you won't win a national competition with a walmart special.
Engines that run on good synthetic clearly are cleaner inside, last longer, and have fewer malfunctions. Check out how Guardian Pest Control out of MN got along with it. Or how an independent owner/operator took his engine to over 400K miles without an oil change (using oil analysis and bypass filtration). Mack didn't believe he could do that and they tore the engine down to check out the parts. The engine was in better shape than other Mack engines running dino and doing normal service intervals. This was done by Mack on their own. It was not sponsored by any oil company.
True some 4.0 engines have seen 300K without going to synthetic. But have you seen a production gasoline engine go to over 600K without any major repair and is still on the road? I have. It is in a chevy pickup in central Missouri. The pickup still runs great and has been on 20K mile synthetic oil changes since the first change. I have seen engines (my step daughter comes to mind) that didn't make it to 40K because it was driven like crap.
Is synthetic for everyone. Probably not. But it is still the best choice overall. It can't guarantee that every engine will last a million miles, but if all the components have no flaws, you will never get an equal engine to operate for as long or trouble free as one that lives on synthetic.
If you like trading every 3 years, or are just looking to change oil as an excuse to get out of the house and avoid the wife, then disregard all this and use the cheap oil. I would like to keep my 60th anniversary edition XJ for a long, long time and with fuel prices what they are (and where they are going), I would like to tweak out all the MPG's I can from the XJ. Synthetics will give me that edge.