qdeezie

Royal Purple is good oil, but as far as coloration goes, as long as there is there is something in your engine to clean, you're going to get the same result as far as dark colored oil is concerned.

Crownman

That test is all BS. And yeah, Amsoil doesnt advertise but they dont exactly make it easy to get. Its great oil but theres oil just as good in my opinion for the same or less money. If you dont plan on exteded drain intervals then the extra money is kind of a waste.

There are no motor oils that are full or true synthetic oils. They ALL start with a mineral base. The differences are how much they are refined and what add packs they have in them.

If mobil 1 10w30 was the best oil ever it still might not be the best for your specific vehicle. Pretty much all modern day oils are plenty good whether they're synthetic or not. The most important thing is the regular maintenance.

justintendo

so you consider ester, AN, and PAO oils to be mineral base?
amsoil is very expensive but hard to get it is not...readily available from any napa or online from their website. most people have somewhere local to them or a dealer around them, just not at a local walmart.
for sure its more important than anything to use correct viscosity and maintain drain intervals.

bluecar5556

Amsoil engine oil application: 1992 Ford F-150 5.8L 5w-30 @ 5 quarts Per quart $5=How much the dealer gets it for $7.50 How much the dealers sells it for $10 How much amsoil.com charges I fail to understand how it is expensive? It is rated at 25,000 miles in normal service and 15,000 in severe service. If you need oil in a pinch, walmart carries mobil 1. Just buy amsoil ahead of time.

fltdriver

The guy I got my truck from, a retired tech at a Ford dealership, used conventional oil changed every 3k miles and a motorcraft filter. He said he just got what ever was on sale because in his opinion "oil is oil". Not saying that he has expertise in oil viscosity, longevity, etc... But.... the truck now has 310,xxx miles on the engine with no rebuild. I've followed his lead over the past 15k miles, using either WIX or Motorcraft filters, and it's still running strong.

If you are super concerned about getting the best oil and not being misled, then check out bobistheoilguy.com. You can spend hours researching brands, types, weights, theories, etc.. about oil. But what it all boils down to is what you want to spend, how often you choose to preform the basics, and personal opinion.

For what it's worth my mother had a 94 Taurus, bought brand new with 12 miles on the clock. She had her oil changed once a year, had the car for 19 years and put 275,xxx miles on it. It was still running strong when she got rid of it to get a Toyota that would get 40+mpg's. The guy she sold it to is still driving it around. Her secret was checking the fluid levels, nothing else, once every month or so she would check all of the dipsticks and reservoirs, refill if necessary (when she refilled she used whatever Casey's General Store brand was). Engine life, in my opinion, is more about how you drive-while still maintaining adequate fluid levels- and less about the fluids you use. They have such strict standards in labeling now that anything that you get is decent quality, unlike 30+ years ago where it really was a crapshoot and you should only use trusted brands.

Just my 2 cents.

qdeezie

This pretty much summarizes it right here for the most part. As long as the oil meets the same spec the Motorcraft oil meets and to take it a step further, our engines run well off of pretty much any oil (provided bearings tolerances are good). Our engines aren't that picky.

I honestly think that the OP's engine has some sort of varnish or other buildup and the synthetic oil is cleaning it out.

Bigred1996

No oil is full synthetic. All of them have some mineral oil in it. All synthetic oils are 75% the same. It's the last 25% (additive pack) that makes the difference.

unit505

For what it's worth, I run Supertech Synthetic 10w30 and have for several years in all of my vehicles including my lawn equipment. Averages around $3.79@quart and I change it every 8K miles in my trucks. Once a year in my lawn equipment. After a little more than a year in my Husqvarna Zero Turn, it was just below the full mark today and still clear. ZERO PROBLEMS! It cured the top end rattle in my '95 4.9 and my former '94 302. You can say what you will, but the Supertech has proven itself time and time again for me. Amsoil was incredible in my atv's. It disappeared by the quart in matter of hours and never any indication of smoke from the exhaust. I've never used Royal Purple personally, but I did change a local Royal Purple reps oil back when I did oil changes for a living in the early 90's. It was a pain in the fact that we drained it from his vehicles into empty buckets and he took it home to use in his lawn equipment. I serviced our local CNG fleet using Royal Purple as well. At 10k miles in a CNG engine, the stuff looked like new when the drain plug was removed. We sent it for testing and it showed a 20% breakdown over 10k miles. Impressive! I had a chance to go to work for Royal Purple in '93 and told myself there was no way that this company was going to survive with the prices back then. Just another opportunity missed! STUPID!