I have been wondering this for awhile. Why do people run thicker oils on stock motors? full build or not?

just dont understand why people do it. If the manual recommends 10w 30 why doesn't everyone use it ?

 

its various on people builds and preferences...

i know that poeple with bigger motors/turbos like to run 10w40 or 20w50

 

Cause folks got brainwashed when FP released info on their RED and BLACK turbos needing higher Zinc/Phos levels. A lot of the oils on that list are higher weight but some are not.

Why would you run a 20/50 oil on a stock clearance block is beyond me but I will say that the day I worry more about my turbo than my motor is the day I drive my car off a 100ft cliff.

But all in the past now FP BB turbos are here

 

If its only a 100ft cliff, you would probably only need 5w30.

 

Yeah yeah, listen to this guy and you will learn alot.

Maybe because FP and some other oil companies have invested resources like money and engineering test to find out what works for their customers, and zinc and phos proving to be the BEST to date anti wear additive, until someone smarter finds something better.

Regardless if one has an FP turbo, Garrett, Bullseye , stock whatever , ZDDP (zinc and phos) is a benefit to the engine,,, when i care about high temps, less friction, ensure no metal to metal contact to save my bearings and top end,,, ZDDP is the ticket

 

Probably the same reason people think the W means weight. They just don't know. The W means how the oil acts in winter for cold starts. Its all 30 weight if it says --w30 but the front numbers just refer to the 30 "weight oil behaves like 10 "weight when its cold. I always wondered if the lighter would be better because it will get to the bearings faster since it behaves like a lighter oil until it warms up.

 

My service manual recommends 20W-40 for warm weather.

 

Here we go again. What a joke. Put over 100k on an evo then preach.

Your modern engine does not require these heavy doses of ZDDP but you know that and brainwashing = money

 

So modern engines dont require good doses of ZDDP maybe that is true for a 1.6 KIA thah has no more than 60 engine HP ,, for the sake of educating the people in this community and not going by opinions i would like for you to show me data of where and how ZDDP is not a good thing for performance cars that coupled with a good Group 3 even better group 4 synthetic.

You have no oil chemist Engineering expirience at least you have not expressed that to this community,,, all i see is you base your facts on a 100K engine that has held up.,,, means nothing to us.

i dont expect a good answer from you, you wont have it because you dont have facts its all opinions.

 

Where's your facts that these high doses of ZDDP keep wear down on 4G63/4B11 engines and prolong life. I'll hold my breath. And please don't just post a couple stupid UOA's

Funny I live in the real world and by some of the last OIL THREADS the highest millage engines on this site have used what you consider **** oil their entire lives. I don't give 2 ***** what a company publishes.

My 130k mile stock block is real world to me and means more to me than whats written on a piece of paper.

For guys coming on here researching thinking damn I need to use an oil with these high ZDDP levels to keep my EVO from giving up its ghost,killing bearings, burning up valves, or scoring cylinder walls in 100k is just foolish and not the case.

Keep preaching man keep preaching. I'll keep driving

 

well another reason why people run thicker oils not just because some like my self are running fp turbos where the increased phosphorous and zinc content are needed, but also a lot has to do with hot ambient temperatures depending on where you live, where I live in cali for the whole summer its consistently around 100*, while some might think thats hot but an engine would be fine on 10w30, at a 30 weight of oil, the point where the oil starts to thermally breakdown happens at a much lower temp then say a 20w50, which being a thicker oil sure it takes a little longer to get up to temp, but at the cost of keeping the oil temp lower due to the thicker viscosity helps to promote longer engine oil life, and at the same time keeping your internal bearings etc happy and not pissed off and scored. there ya go.