What grade motor oil should I be using with my turboed engine now? I have been using 10w-30 Synthetic oil, but I was reading many people use 5w-30 or 40. Also saw the GReddy ad with their motor oil line having a 5w-40 for aftermarket and turbo charged cars.

I've been using Royal Purple brand, which I'll stick with, but I honestly don't know too much about the numbers other than one is viscousity and the other temperature. Couldn't find anything on the website of god (howstuffworks.com) so could you guys explain it to me?

 

5w-30 synthetic should be fine, but i have also read that with bigger turbos u should use thicker oil. but i just use 5w-30 castrol syntec, and have had no problems.

 

Your 5w30 is fine as long as your just a little 13 second dash drag racer.

and remember dino oil suxks .

 

5w30 is pretty thin. The norm is 10w30

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AF-P Dunc &raquo;</TD></TR><TR><TD CLASS="quote">5w30 is pretty thin. The norm is 10w30</TD></TR></TABLE>

False.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidShipCivic &raquo;</TD></TR><TR><TD CLASS="quote">False.</TD></TR></TABLE>

Elaborate please

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidShipCivic &raquo;</TD></TR><TR><TD CLASS="quote">

False.</TD></TR></TABLE>

haha ok then you're entitled to your own opinion. Hit the search button and then come back and let us know what the majority of people like to use

 

A 5w-30 or 40 etc. isn't really as thin as a 5 w or as thick as a 40 w. The thinner synthetics have less drag than higher wt. conventional oil. Synthetics also don't break down as readily as dino oils. The protection they provide over conventional oils is significant. Amsoil synthetic and Hastings filters are some of the best on the market. Amsoil makes a number of different oils. Some are specifically engineered for racing and severe use. Their lower level synthetics are only slightly better than most other synthetics but their upper end synthetics are testing out better than other synthetics. (see independent lab tests)
I heard from my shop that Precision Turbo told them that the really thin (0w - 40w etc.) synthetics may cause turbo seal leakage.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drintegra &raquo;</TD></TR><TR><TD CLASS="quote">

Elaborate please</TD></TR></TABLE>

they are both 30 weights. The 10w or 5w is the viscosity of the oil in cold weather. The W in 10w, 5w, 15w stands for winter, not weight. In high temperatures, 5w30 and 10w30 are both 30 weights and will behave the same. It's in cold weather where the 5w30 and 10w30 will differ

 

Lots of people think that the weights or viscosity of multi-viscosity oil (like 10w-30w) are the same as 10 weight when cold and 30 weight when warm. The reality is that multiviscosity oils are a compromise. As they heat up their particular polymers link together more to make them more viscous or thicker than a single weight would be. A 10w - 30w is really a little thicker than a regular 10 wt. when cold and thinner than a regular 30 wt. when hot. This isn't to say that it acts just like a conventional 20 wt. It is thinner than a 20wt. when cold and thicker than the 20 wt. is when hot.
The w doesn't stand for winter . It has been used to mean weight or viscosity. Some manufacturer may use a 'w' to mean winter but it would just be a marketing gimmic.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by paul vang &raquo;</TD></TR><TR><TD CLASS="quote">they are both 30 weights. The 10w or 5w is the viscosity of the oil in cold weather. The W in 10w, 5w, 15w stands for winter, not weight. In high temperatures, 5w30 and 10w30 are both 30 weights and will behave the same. It's in cold weather where the 5w30 and 10w30 will differ</TD></TR></TABLE>

thanks, figured that

 

i used valvoline vr1 40 to 50 weight b4... it was fine

went to mobile 10w-30 full synthetic and now it seems like its leaking past my seals or something. it smokes after i drive when i come to a stop light but goes away when i start moving again...

maybe the 10w30 synthentic is too thin for my precision gt35e?

id like to know

 

what's that one site? bobtheoilguy.com? i forget. lol someone was running some 0w-10 or something from what i read a while back. i run 20-50 though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by paul vang &raquo;</TD></TR><TR><TD CLASS="quote">

they are both 30 weights. The 10w or 5w is the viscosity of the oil in cold weather. The W in 10w, 5w, 15w stands for winter, not weight. In high temperatures, 5w30 and 10w30 are both 30 weights and will behave the same. It's in cold weather where the 5w30 and 10w30 will differ</TD></TR></TABLE>

To add to that....

Less viscosity modifiers = better
10w-30 will have less viscosity modifiers than 5w-30.

So if cold climate is not a major concern to you, 10w-30 is definately the way to go.