oils

[wannab]

do additives to oils like duralube actually work,
as their infomercials are quiet convincing,if so any recomendations as to which brand?
would you use it in a newly built engine to be run in?
as for transmissoin same questions.

[Tim Falce]

I wouldnt use any oil additives whatsoever, even more so in a new engine. Some additives will stop parts wearing and in a new engine you need things to bed in. The rings need to seal on the cylinder walls and additves will stop this.
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[graham bahr]

i quite agree with falcemob, i never use additives, also when building engines for other people i recomend fairly basic (but decent quality) oils, most oils are full of additives they are either there cut down on friction (bad if you want your rings to seal) or extend the oils service life ( your not going to leave the oil in your race engine for 1,000's of miles are you?) they also put them in to help stop oil throthing up in the hydralic tappets that you have now changed for solids, not to mention a large dose of detergent to keep the engine clean inside, but then your engine wont be getting dirty if you change the oil regulary.

so if nothing else why pay more for stuff that wont make your engine any better.

[tangoed sparky]

The place that I worked at a few years ago was a haulage company of sorts and a rep for one of these oil additives companys came in one day to try to sell us his product. He proved its anti-wear quality's by comparing our engine oil to his oil with the addertive in it and shock horror his oil did allow wear to take place on the piece of bar in his test rig were as our engine oil did. I then asked the chap to repeat the test but with our other oil that we used. I did not tell him that it was an EP oil used in truck axles and gearboxes. This oil did not allow the test rig to wear the bar. It turned out that this additive was for extreme pressure enviroments and engine's do not have these extreme pressure on there bearing surfaces. It was a con!
I also remember somthing that we were taught at college was if you add a super slippy addertive to a gearbox then you run the risk of over lubricating the syncro's and thus run the risk of going back to the days of double de clutch.

[KC]

All you need is good quality motor oil with the correct viscosity for your application.

The bearing clearances on an engine are setup for the correct amount of oil molecules to exist in between them. When you throw in teflon or other "friction" reducing particles bearing clearances must be changed in order to handle the additional material. These particles are designed to adhere to metal surfaces and this reduces the amount of oil flow between the surfaces and retains heat between them. Oil is not used solely because it is slippery, it works as much as a heat exchanging liquid. It captures heat and takes it away as the oil is pumped between the bearing surfaces. Anything that impedes oil flow is detrimental to bearing surface life.

[wannab]

thanks to all, certainly will not be using those additives.

[zefarelly]

all oils have some form of additives in them anyway dont they . . .so why would you have to use on top of another ? surely you should be able to pick the best one in the first place ?

fuels a different matter though as no one makes decent petrol anymore (off the forecourt anyway)