Oil Recommendation

The 5W40 would be a better option.

Seriously don't understand why some want to run such a heavy oil in a precision jap engine. These engines are not old banger V8's. Seriously for street use I'd even go a 30 weight full synthetic. Your engine will thank you :br:

 

Hence why I run a 5w30
The motor LOVES it!!

 

Every VG30 I have seen that run 5W engine oil has developed oil leaks.

Not so much an issue in a fairly fresh engine but in a used one of indeterminate age. This thin oil can fair piss out of it wrecking rear mains, cam seals etc.

Look in the service manual that 5W viscosity engine oil isnt on the approved list either.

 

I have always ran with Penrite 10W-50 and have never had any problems or noisy cold starts.

 

But 5W has nothing to do with running the engine, it is the cold start up viscosity rating only. Once the engine is started, the nW rating means nothing.

 

Probably wouldn't be running that in it specially in summer that thin, I'd go for at least 10w40, that's what I run, run's great. 0w30 and 5w30 is normally for places that snow lol

 

The issue is that the oil film doesnt not hang around on internals with very thin oil.

Assuming a thin oil should be OK is a bit of an issue. If the manufacturer recomends a certain viscosity why wouldnt you follow it?

For all we know there may be issues with the oil pump design/clearances that mean thin oil shouldnt be used. Start up is the single most detrimental time of an engines life. If they calculate that you need 15W oil to slow down the drop of cold oil into the sump on start up. Who are we to second guess that? Film coating at startup may be an issue ??

All I know is I have seen lots of VG30's running castrol edge 5W or mobil one 5W that have started to have oil leak problems where NONE existed before. We are NOT talking one or 2 engines either.

 

lol well according to the manual;

"On turbo engines,..., 5W30 should be used only under extremely cold conditions."

Viscosities recommended for -20degC to +40degC and over;
10W30/10W40/10W50/15W40/15W50
Viscosities recommended for -10degC to +40degC and over;
20W20/20W40/20W50

[TIS]

 

And there is your answer, It doesnt snow much here..........

So USE 10W40/50 or 15W40/50, which is what I said.

 

10w/40 is what I'm running and wouldn't go any lower .

my piston bore clearances are pretty tight for a forged motor (benefits of cryo and torque plate)

may run 15w/50 with ethanol .. will see how it goes.

I did notice a couple of degrees rise in oil temp though changing from 15w/40 running in oil to 10w/40 sin .. requires more investigation

 

Penrite have a 10W-70 in their high performance oil series. Would that be suitable for the zed or is the 70 too high?

Abraham

 

Don't fall for Penrite's "+10" marketing BS, this is one of the reasons I won't use Penrite oils. Too focused on marketing hype at the expense of their product these days imo.

Bit like DBA with their 'Kangaroo Paw' BS. If they were serious about making a quality performance rotor, it would be curved vein, period.

 

Oh ok, so there is no difference between the Pendite 15w-60 & the 15w-70? But can they still be used for the zed engine or is the 60/70 too high? I'm asking as most have mentioned the 15w/40

Abraham

 

As far as I know, there is a difference, I was using Penrite SIN in my racecar when they changed them, so I rang their tech dept to 'discuss' as imo the extra 10 made the oil I was using too heavy for my FTO.

The tech guy really didn't have an answer for why the +10, but I got the impression it was clearly a marketing ploy to differentiate their product in the marketplace.

Personally I think a 60/70 weight oil would be too heavy. General consensus is the 10W40 is about right.

 

http://www.performancelub.com even cheaper on his website for the engine oil (as he doesn't have to pay for ebay fee's)

 

I've just completed my change. I've stuck with Penrite 15W-40 Semi SIN and my favourite drift oil filter.

I figured there is no point spending heaps on oil as I go through 5000KM in no time.
If it were a race car, I'd definitely go for something more better.

TY Fellow Zedders.

 

The FSM was first written over 20 yrs ago.The FSM basically recommends a SAE 40 or SAE 50 oil when the engine is at operating temperature. The lower the nW rating in a nW-40 or nW-50 the quicker it will thin to SAE 40 or SAE 50 as the engine warms up. The perfect oil would have a constant viscosity regardless of temperature.

If a 5W-40 synthetic oil was readily available when the FSM was written then I suspect they would not have recommended a 5W-20 or 5W-30 for cold climates when a 5W-40 synthetic would have the same cold start qualities without the loss of viscosity when the oil reached operating temperature.

If the oil is going to drain off the internals then it will do it while the engine is hot and the oil is at its thinnest. The only time there is a significant difference between a 5W-40 and a 10W-40 is when the oil is below 40 °C at which point the 5W it is still more than twice as thick is it was when it was at 100 °C.

 

Penrite 15W-50 fully synthetic here.

VG30DE - 210,000-ish km