Car Forum World

I have a 911SC Porsche year 1980, and I changed to using unleaded petrol. Will there be any problem ?

you are good with unleaded. Everyone I know with old Porsches as well as me uses it all the time. The octane is more important than the lead or non lead.

Don't think about worrying about this.

depends wheter you are supposed to use unleaded in it .if you're separately from pinking like mad you may have problems .best ask your porsche dealer

you can get away with having the timing adjusted, you may still have to use a lead additive tho'

i could have thought if you still had some leaded fuel in the tank you may be ok so far but don't put anymore in till you cheched out what you need

Yes if its not transformed to run on unleaded,you could wreck the engine or it may go on fire .

depends on if valve seats have been done if you not sure use an additive

Not if the engine was transformed to run on unleaded fuel, but if it has not, you will have to purchase a fuel additive to put in also. you may be able to get a range of makes at your local petrol station. If your car is not intended to run on unleaded petrol, you may be able to damage your engine pretty considerably by running it constantly on unleaded without an additive. A week or two here and there should not make too much difference, but still would not risk it.

I doubt that it is supposed to run on leaded fuel because that is been out since 1973 in the United States I know you are not in the U.S. but is Europe seven years back on that?

If it's supposed to run on leaded fuel, you'll sooner or later wear out the valve seats if you don't use an additive. it'll take a several years usually to wear out. I drove an old Mercury Montego for some number of years on unleaded and I never noticed an issue. If I were you, I would not worry about it.

Yes. Get a lead additive at the car parts store and use it religiously. After a full rebuild you may be able to use unleaded.

The only issue with switching from leaded to unleaded gas is that cars without hardened valve seats could need a valve job a little sooner. American cars all went to hardened valve seats in the late 1960's. I believe that Porsche went to hardened valve seats throughout make of the SC, but I'm not sure. If you recently went to unleaded, lead deposits on the valve seats will last for some time. when you ever get a valve job done, you may be able to ask the mechanic to check the valve seats for wear, and if they're worn, have them replaced with hardened seats. I do not believe this will be needed, but, as I personally know a couple of persons in the US driving older SC's with more than 150K miles on the original engines. Both cars have been run entirely on unleaded gas, without lead additives, for at least the last 100K miles, with no obvious ill effect.

Drive it and enjoy it.

You never want low quality gas in a porsche Engine that is which causes 10k dollar problems, regardless the year it still uses a high tech and high peformance engine which desires highest petrol. but if you really have to pay less then just use the center or 87 fuel or just use 81 then 91then 81 then 91 and us a pattern.