What is the thickest oil I can use in a 350z?

[Michael robinson]

As the title states what is the thickest oil I can use in a 350z ? Just need to test something ??

[Sam Mcgoo]

I would pm or e-mail Oilman from Opie oils - they are pretty good with advise.

 

[djtimo]

You could use a 10w-40 no problem. I have used 15w-50 in my engine but its not stock so im not sure if a 15W-50 might be a little heavy for a tight clearance stock motor.

[buster]

i couldn t get any 5w 30 castrol edge fully syn yesturday so opted for 5w 40 castrol edge fully syn seems ok so far.

[Jez @ H-Dev]

Nissan specify 5w-30, 5w-40 or 10w40 - so any of those will be fine.

 

I'm using 10w-50 as the engine in my car has knackered piston rings and it slows the rate of oil loss...

[Michael robinson]

Jez that's what am trying it for mate as I think my rings have went in one bank , will 10.50 clog the gap ?? Just trying to prove it with out taking the engine to bits . As the exhaust is smokey as hell

Can I pm you what I have done and could you give me alittle advice please??

[Mark@Abbey m/s]

try a 20W60 oil that the thickest that is around. But i doubt that will stop the oil buring thou.

[Michael robinson]

Cheers mate is there any way of telling weather my rings are nackerd or its the oil seals with out striping the engine down completely ??

Just av got loads of smoke coming from the exhaust and oil in all 3 cylinders on the driver side of the engine av removed the hole exhaust and cleaned that ( removed the filter out the cats as one was clogged , so basically decatted ) av replaced the oil with 10-40 which is the thickest the Manual says to use and it's still smokey .

I Would like to identifie the fault before I take it to a garage that's all .

[Mark@Abbey m/s]

we can look down the bores to inspect the cylinder bore condition

do a cylinder leakage test , compression test.

 

But you cant inspect the oil rings I am afraid.

 

I thought it was the Rev Up motor that had oil uage issues but it seems the early car's (DE motors) are starting to show problems now

[ATTAK Z]

Please have a look here folks

 

 

http://www.350z-uk.com/forum/viewtopic.php?f=10&t=50961&hilit=+oil+consumption+poll

[Michael robinson]

Is it true if I put compressed air in through the spark plug hole and I hear it coming through the oil sump that my rings are nackerd ?

Just it's strange for one bank of cylinders to go all at once . Could it be my stem seal's ??

[Mark@Abbey m/s]

Is it true if I put compressed air in through the spark plug hole and I hear it coming through the oil sump that my rings are nackerd

 

In a word no, this will show you have a loss via the piston rings , but the oil control rings work in a different way to the top 2 compression rings. You will always get a small loss as the piston rings have a small gap to allow for expansion so even as the rings are correctly placed you will get some gas pressure loss.

 

The oil rings work by scrapping the oil from the bores. They are the lowest of the rings pack.

 

Mark

[Southernspeed]

As Mark at Abbey has shown me, putting stock cats on can almost eliminate any exhaust smoke as they burn so hot and burn off the oil. Though only a temporary fix, it does work.

So as you've 'de-cat'd ' yours, maybe get hold of some used cats and fit them 'til you can do a motor swap/rebuild. I think Mark may have some available, worth a call.