91Zman

First question, what octane fuel do you guys put in your Z? Second, i think my car is burning oil, my chrome exhaust tip is black and i touched it and its sticky. My oil dip stick is above H, could that be the problem?

AZ-ZBum

if it's stock, all you need is 87 octane.

Fast240Z

Be careful with your oil over the full mark, you could blow gaskets and seals, etc.

91Zman

Anyone have ideas on my exaust issue?

WolfMan

the exhaust issue... Well my Z does not have that problem, maybe you already blew a seal because of to much oil? Get it pressure checked for leaks, and drain the oil to check for foreign fluids. Also, I dont think it is oil out the back, well, what kinda exhaust? Because thats an pretty long distance for oil.

PS Keep the oil in the middle!!!!! its a old car man

91Zman

i have flow masters

WolfMan

nice, did you check for leaks? and another thing you could prolly due is check for compression, maybe your rings are worn out? also did you take it to a shop and pressure check it?

91Zman

About how much does it cost to get it pressure checked and/or have the piston rings replaced (a general estimate so if i go to get it done i don't get ripped off)

Fast240Z

you could get a shop to do a leakdown test for under $100

91Zman

Can you explain to me what they do?
ABout how much would piston rings be?

WolfMan

they are just going to put pressure into your system, and if it does not hold the pressure that means there is a leak, and a set of rings I don't know, check parts america or summit, parts america will give you the cheapest/ prolly low qual, and summit will give you the better ones and thier price

good luck

91Zman

thanks. My oil is High, just as i thought. Tommorow im changing my oil, how many Quarts do i need. 4 if im correct?

WolfMan

4 and 1/4 if I remember correctly, I just dump 4 in, then drive a block, and let it sit. Then I proceed to top it off

pete8717

I run 89 octane with an STP octane booster. I don't know how much that raises the octane level but I definitely notice the difference if it's less than 89. I had my brother fill my 300zx up while i was putting air in the tires and he put in 85 octane and it ran like ****. As for the piston rings, I've always said doing it yourself is the fun part... I tested the compression on my 300zx on a 40 degree day and I was pushin about 160...I think psi...whatever the pressure tester was measured in...I don't remember.

91Zman

Did my oil change today, 4 quarts, car runs alot smoother now....i think the high oil was the cause to alot of my problems (Jerky acceleration, ect ect). Hopefully tommorow morning when i go to school ill find out for sure if its running smoother (i only drove it around 2 blocks tonight). Last time i had 4 Quarts of oil + 1 quart of engine treatment

AZ-ZBum

You're wasting money. But hey! If it makes you happy, go for it.

No stock Z31 requires more than 87 octane. Running a higher octane than required can and will cause other problems.