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Open and read your owner's manual to find this information. Use only the octane rating stated there. If it requires premium, do not use regular. Pinging and engine damage can occur. It says "Premium Fuel Recommended", so while you can use regular, you can expect less power and worse fuel consumption than if you used premium. The difference you find in filling up the tank is usually offset by the worse fuel mileage, so you don't end up saving any money. The Mark VIII has a pretty sophisticated engine management system, and it's knock sensors should prevent any detonation. You can get away with using regular (87 octane) fuel, but you will lose gas mileage because the system will add more fuel to each combustion cycle in an attempt to offset the difference in octane rating. In addition, the knock sensors will only tell the engine computer to adjust fuel timing to avoid detonation after they detect that detonation has already occurred (damage may already have been done). If you are going to insist on running regular in your Mark VIII, you would be wise to not floor it.
If you want to use regular gas without the negative consequences, look into purchasing and installing chip with a tune customized for running regular gas. -JMiles_T Answer #4 I see no problem running 87 octane in either one of my two 1994 Mark VIII vehicles. Both get between 20 & 22 MPG combination in town and some HWY and both get 30 MPG HWY no pinging no loss of power. They both have over 140,000 miles, One Hundred & Forty Thousand Miles on them. Neither one uses any oil between oil changes and they are changed at 3,000 mile intervals. The bigger problem I see in loss of performance and mileage is when my local station snuck in 10% alcohol on me. Mileage dropped immediately 4 miles per gallon. I changed stations with a sign stating 100% Gas No Alcohol mileage came right back up. If you run 87 Octane fuel in your Mark VIII and it pings, you have other issues. Find a repair shop that has a fuel system cleaner (Machine ) called MotorVac. & have your fuel system & injectors cleaned. Also there is an Octane switch on the Mark VIII's it's under / around the driver side strut tower cover. It looks like the old spout connector in fact it's interchangeable mine is still in place but it can be removed and that will drop the timing 4 degrees. Look close cause there will be two ( shorting ) bars / Switches ~ ~ one is the spout the other is the Octane switch / shorting bar. I didn't need to remove mine it was unnecessary. I'm just letting you know that it is there if you feel the need. I've been making my living working on vehicles for 42 years ASE Certified Master Tech W/L1 Advanced Diagnostics. Take it for what it's worth, but 87 Octane does fine in both my Mark VIII's no problem. drl
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32 valve in-tech v8 out of a 91 Lincoln mark viii will it go in a 94 mark viii if the 94 had the regular 302 v8?
It should fit right in.
What kind of gas- regular for 1997 Lincoln Mark VIII?
They run best on premium but you could get away with regular but the MPG and the performance will suffer.
Can you use regular gas in a 1993 Lincoln Mark VIII?
You CAN use regular unledaded gas in the Mark VIII. However, the performace will suffer, as will the gas mileage. When you think about the fact that premium unleaded is normally about 20 cents a gallon higher than regular unleaded, you are going to be out less than four more dollars if you fill an empty Mark VIII tank with premium rather than unleaded. The loss in gas mileage using the regular unleaded would cost more than this in the long run.
When was Jaguar Mark VIII created?
Jaguar Mark VIII was created in 1956.
Will a climate control from a 1995 Lincoln mark vIII work on a 1997 Lincoln mark vIII?
No
When did Pope Mark VIII of Alexandria die?
Pope Mark VIII of Alexandria died in 1809.
Is 1997 Lincoln mark viii has a v4 or v6?
All models and years of the Mark Viii are v8's
How do you jack up your 1993 Lincoln mark VIII?
go to markviii.org. they have a answer for almost anything with the lincoln mark viii
Need info on how to run power to front seats out of a 92 Mark VIII seats are going int a hot rod thank you Slypnslydaolcom?
There was no 1992 Mark VIII. The Mark VIII started production for the 1993 model year.
Is there a Lincoln mark VIII SRS?
There are two models of the Lincoln Mark VIII. The base or standard MARK VIII and the Mark VIII LSC. The LSC was introduced halfway through the 1995 model year, and continued to the end of the Mark VIII production. SRS refers to the SUPPLIMENTAL RESTRAINT SYSTEM (air bags). This is why you may see the letters SRS on the panel above the glove box area and on the steering wheel horn pad.
Will the interior from a 1993 mark viii fit in a 1992 mark vii?
no
What are the consequences of using regular gas in lieu of recommended premium in a 1997 mark VIII?
poor fuel milage and wear's fuel system out sooner. loss of hp
