what petrol to run?

[mtopxsecret6]

Im not sure which section this needs to be in.. and may seem like a very basic question.. but. what fuel should i run my standard 260 on? i was thinking about bp ultimate like the 32? will i need that lead replacement stuff? its a 74 model 260? thanks guys.

[Zedman240®]

Unless you have modified your head with stainless valve seats, you will have to run with an lead additive..

[mtopxsecret6]

im guessing its not modified.. but its ok to run bp ultimate? and how does this additive work? pour x amount into fuel tank before putting fuel in?? sorry.. ive not had to do this before.

[Zedman240®]

Bp Ultimate is fine or Mobil Synergy 8000...pour it in then fill your tank!

[HELLFIRE!]

Go to an auto parts store and buy a large bottle of the additive (I use Lucas oils Lead Replacement) and keep it in your car, it works out a hell of a lot cheaper than buying it from the servo. Instructions for usage are on the bottle.

[pauly_adams]

i dont use a lead substitute and belive its not neccercery. i just run plain old 95 ron or 98 ron fuel and have had no problems what so ever, i have been told by multiple mechenics who work just on zds eg the zshop not to run it and i would tend to agree. in the past 2 years ive had my zd, there appers to be no extra where on the valves or on the seats and has no running problems what so ever. thats my 2c i think its more on personal oppinion then anything.

 

 

cheers pauly

[620Z]

I bet none of your "multiple" mechanics where willing to give you a written guarantee with their statements. Or will offer to rebuild your motor for nothing if a problem does arrise in years to come. 

[mtopxsecret6]

so if i take the tappet cover off.. will i be bale to see what valves im running? im pretty sure its all standard.

[Zedman240®]

The only way to see the valve seats is with the cylinder head off the block. If your engine starts to puff blue smoke when starting, or coming off the "gas" pedal, might be time for a head rebuild. Perfect time to do the valve seats if you want to.

[mtopxsecret6]

ok.. well i havent got the car with me yet.. and besides its been sitting for 7 years.. so.. who knows what im expecting.

[Hunter]

Do all standard 2.8L head/block combos have unleaded proof valves and valve seats standard?

[C.A.R.]

Basicly, yes. I've never had any problem in the last 6+ years of useing PULP in my L28.

 

Apprently the early 240Z heads don't like unleaded fuel for long periods though...

[oldmates260z]

I have a stock 260Z 74 run on 91 ULP no additive and have had no problems and done about 10,000 k's

 

 

[Hunter]

I have personally never had any trouble, and by the sounds of it I will not be having any trouble

[DoctorZ]

Look at me digging up old posts...yeeehaaarrgh!

 

The rule of thumb for most engines from japan is whether they we're manufactured before or after 1975.

Japan introduce unleaded petroleum in 1975 and pretty much all manufacturers either replaced their engines or introduced hardened valve seats to compensate for the lack of lead.

If you're running a pre 75 head on unleaded then you can possibly be doing damage and not realising it until it's too late. You can switch to unleaded for a while because the lead you we're running will stay partly embedded in to the valve seats but will wear off over a short period of time.

So basically you could have 2 motors of the same capacity and model but one was produced before 75 and one after 75, you could find different materials in the head therefore requiring different fuels.

 

All that said, I'm not a mechanic so if anyone has better info or thinks I'm wrong, please post your expertise