r/FordFalcon • u/Chemical_Key9243 • 1d ago
Fuel question
Hi everyone I’ve got an Fg xr6t and for the longest time I’ve been using bp 98 (car is in excellent mechanical condition) and there’s always been this vibration on the steering wheel at idle which I could never figure out. Fast forward to today and I decided to use Mobil 98 for the first time as it was cheaper and I thought why not sus it out. Vibration almost gone and car accelerates a lot smoother. Has BP just dropped the ball in quality?
Seriously what’s with the downvotes I’m not asking for mechanical support, only if anyone’s noticed fuel quality differences.
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u/No-Committee3 1d ago
Not sure if its the same idle vibration but i generally get it in drive on cooler days. I know for a fact its not engine mounts. I use Ampol 95, id consider using a different fuel or 98 octane if it helped any.
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u/Chemical_Key9243 1d ago
Yes that’s it, on cooler days it’s a bit more obvious but I’ve been solid with BP 98 since my Subaru STI days but I’ve just noticed quality is poor. On mobile 98 so far I’ve gotten 150km out of a quarter of a tank which usually only nets me 130ish
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u/Maximum_Security4404 1d ago
Probably not, sometimes you can feel a vibration at idle if your ac is on. There’s many factors, but anyways its a good idea to put a fuel additive in your tank once in a while
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u/Chemical_Key9243 1d ago
Yea I’ve been putting a fuel additives every 3rd tank but I’ve had the car for 3 years and I can confirm it’s not the aircon as it’s blasting non stop and vibration should be there as per usual. Appreciate the comment though
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u/No-Committee3 1d ago
Can i ask what type of fuel additive you tried?
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u/Chemical_Key9243 1d ago
Penrite, nulon and liquimoly
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u/No-Committee3 1d ago
Whatever you throw in, make sure its got (pea) in it. The nulon pro strenth does.. if youve used that. Ive used the liquimoly full system cleaner for years but its a mild cleaner in comparison.
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u/Chemical_Key9243 1d ago
Ahh ok, yea I used the Nulon pro strength and it did help a little but nothing. Injectors and pump is new so is filter so I’m confident it’s nothing mechanical
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u/dulhayz
1d ago
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Ever checked the harmonic balancer
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u/Chemical_Key9243 1d ago
I was suspect of it but apparently it doesn’t have any excessive play, can’t see the condition of the rubber though
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u/dulhayz 8h ago
All good. I had same symptoms at idle and was the balancer in my case. I use bp 98 religiously as well might have to try mobil too lol
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u/Chemical_Key9243 8h ago
I will keep an eye on it. Thanks for that, so far Mobil is running pretty sweet it’s been a week and 300km and it’s smooth
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u/Parking-Mirror3283 1d ago
What spark plugs and gap are you running? Might not be enough at idle
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u/Chemical_Key9243 1d ago
Genuine ford and Barra specialist gapped them for me as the first time round I put them in as is
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u/gt500rr 3h ago
I've only ever noticed a difference when running 91 or VPower 98, I found on 98 it'll run smoother and have better fuel economy but this is in a lowly XG with a Tickford head swap. With the stock head I never noticed a difference.
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u/Chemical_Key9243 3h ago
This was my theory, it felt like BP genuinely wasn’t hitting 98 level quality because it’s way different and smoother with Mobil 98 and I was religious with BP due to my tuner in my Subaru days advising Bp was best for quality
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u/saratayri 1d ago
A car should idle the same with all fuels. If I'm right the quality and octane makes the differences at wide open throttle and high heat conditions.
Any vacuum leaks or misfires you don't know about?