Anybody have an opinion on using an Oil Additive such as Duralube, Prolong, MotorUp, Slick 50 etc on a these things actually work?

[email protected]

Re. 1

I've tried slick 50 and *hated it*. It made the car perform significantly worse. I immediately went out and changed the oil (again) to get rid of that stuff.

Use a good synthetic and you'll be much happier (mobil-1 is the best)

[email protected]

Re. 2

Ive added Duralube and it really does work. I have a 90 240sx with 115K miles on it and the engine would normaly run about a little over halfway on the temperature gauge. Now that Ive put the Duralube in everytime Ive changed my oil it runs constantly at 3 lines from the bottom, (a little less than halfway). My car also used to burn a tiny bit of oil but now it doesnt. (though the duralube might not have helped that, but it stopped doing it after I added the duralube and ran it for a couple hundred miles) also Ive traveled 10 hours straight going about 95+ mph on I95 and the engine temperature never budged from under halfway. Also ive noticed it starts easier in the cold weather and the engine warms up faster now. Duralube is added WHEN your oil is changed. If you do it yourself leave it a quart low, and add the duralube (1 quart bottle...of course) and if you get a shop to do it (why? some ppl do) tell them to add the duralube and 1 less quart of oil. (It says this on the directions on the bottle, one of my friends didnt read it and overfilled the engine. Luckily Nissan builds strong engines and he didnt blow a seal or nothin, it just smoked for about 20 mins and the valves clicked alot, now its fine though. He was lucky.) Hope this helps.   Also if you dont wanna spend 15 bucks on duralube STP makes a 4 cylinder (and 6, 8 cylinder) engine oil treatment also. All those others, do not work. Duralube I can say does actually help, older cars especially. Prolong is crap, Slick 50 is worse.  

Steve Phillips [email protected]  

I would never use a Teflon (ptfe) or an oil or petrochemical based product as an additive in an internal combustion engine. Even Dupont know that! ptfe will only handle temperatures up to approx 140 celsius, and of course a petrochemical product is also combustable. When the top of your piston will reach 425 to 550 celsius, depending on sort of engine, what happens to these products? they don't last. Ptfe can even coarse more problems, ask a turbo enthusiast. How ever I do know of and still use this product from Europe.IT'S CERAMIC BASED. Check out

Mark George.