I read before in some post that Mobil 0w 40 had pretty good results on our motor but I just want to make sure before I do something stupid.

Is this is too thin? This will be going into a built motor in Cali pushing say 600whp on 91 oct. Any issues before I start pouring the motor oil in?

 

imho, i think its a tad too thin high boost. im sure it would work fine but i'd go with a thicker oil. ive had great success with Rotella Tsyn 5w40.

 

is it thinner? b/c the W stands for winter or cold weight... and when warmed up both are 40. both oils have been rated as highly recommended on the vq from resolutes oil analysis thread even for turbo/built vq's.

 

Im running motul 15w50 at the moment mate, does any no if that sounds a bit heavy??

 

i even use 10W60 Castrol. You should use the type of oil which matches your climatic conditions. Running a Z in high temperatures with long time WOT means you need a sort of oil which is thick enough at high temperatures. If you run your car in cold conditions go with a thinner oil like 10W40

 

what about for a car with stock engine pushing 420whp?

mobile 0w-40 would work great?

 

yeah too thin as others said, I tried it and was burning oil, I switched to 10w40 conventional and all is fine, may even try 20w50 in the summer here

 

The first number in the weight is for the cold weight/viscosity whereas the second number is for higher operating temps.

Mobil's 0-40 is known as their 'European' formula since it can be cold/freezing in the mornings so you want thin so it cycles through the engin quickly to coat all the moving parts.

I use Mobil 0-40 on my tubo Z as well. One thing you might notice is that after the car has reached normal temps, the car does seems a bit more 'sluggish' on getting in to boost which I think is due to the thicker oil at operating temps.

 

Yes, sounds heavy and from a lab test conducted by my350z members, Motul didn't perform as well as some Castrols and Mobils.

 

I've been running the 0w40 on the latest build and all is well so far. No smoking at all so far. My car is a slug when cold, but once its up to operating temp its right as rain.

 

I didn't smoke either, it wasn't that bad, I just noticed higher oil consumption, so I changed which for me it was an easy choice since we don't get low temps in the winter down here, so going to a 10W oil was not a concern

 

I've had the best results (based on UOE) with Mobil1 5w40 turbo diesel truck. This is on a stock block ~420whp.

 

I run 0-40 in my GTR, thats the oil it calls for, so Im guessing it should be ok in your car

 

0W40 is fine, but like others have said, you main burn a little more than normal (depends on tollerances within your specific motor).

Plus you wouldn't want to get in with a cold engine start and go...you'd want to let it run for a couple mininutes to warm up (more than if you were running a 10w40 or so)

just my $0.02
Tom

 

See this thread: https://my350z.com/forum/engine-and-...-and-info.html

Resolute seems to know more about oil than anyone else I have seen post in this forum. I'm guessing that he is a chemical engineer, but I don't know this to be fact. Nonetheless, he has provided a lot of invaluable information about oil for our cars. Mobile 1 '0W-40' is one of the oils that he recommends.

Here is a quote from the first post:

"Are 0W-xx oils too thin for my engine?
As discussed previously, multi-grade oils are designed to behave like two different oil weights at two different temperatures. Since an oil is thicker with colder temperatures, a lower weight oil flows better, and better protects the engine during start-up since it is easier to pump to critical areas. So, a 0W-xx oil is a better oil for start-up, especially in cold temperatures. When the oil heats up and starts to thin out, it becomes a heavier weight oil just like a 5W-xx or 10W-xx oil would. So, a 0W-xx oil is only a “thinner” oil when it’s cold- where it is a benefit. At operating temperatures, a 0W-30 is the same weight as a 5W or 10W-30, just as a 0W-40 is the same weight as a 15W-40, etc... Therefore, 0W-xx oils tend to be better suited for year-round use in any climate, since they flow better in cold temps but become as thick as any other similar grade oil when hot. "

 

so whould it be better to run mobil 10W 40 so I wont have to worry about having issues if its not completely warmed up at start up?

 

Thanks for the info... So wouldn't 10w 40 have a little more protection on start up in the HOT summer months here (110)? It keeps refering to when it's COLD it will benefit but how about when it's not cold?

 

really??? It's recommended year round or preferred in winter? what yr is yours?

 

Not necessarily. Please read the thread to which I posted the link. If I remember correctly Mobile 1 10w-40 does not perform as well as Mobile 1 0w-40 in our motors. Two oils recommended by Resolute to first try are Shell Rotella T-Syn 5W-40 and Mobile 1 0W-40. He provides all of the information in the thread to back up his recommendations.

No offense to anyone else responding to this thread, but Resolute really, really knows his **** when it comes to oil and internal combustion engines. To me, his appears to be the advice to follow. Just read through that thread and you will quickly see what I mean.

 

I live in Florida. We get into the upper 90's during the summer time. Still, I'll be running Mobile 1 '0W-40' in my new motor. Remember, when the oil gets hot, the viscosity will increase on its own. Nonetheless, having a very low viscosity on startup seems to have some advantages. It should more quickly lubricate the motor on startup.