Mobil 1 hmmm - Ford Mustang Forum

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post #1 of 10 (permalink) Old 01-06-2003 Thread Starter
balaso's Avatar
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Angry Mobil 1 hmmm

I got a problem I read somewhere that Mobil 1 synt was recommended for the mustang 5.0, so I went ahead and put it in, now I have some clicking and knocking when the car sits at a idle , its driving me mad, I used 10-30weight my car now has 109,000 miles (still runs great by the way) should i use a heavier weight, or is my motor had it, let me know if anybody has had the same problem, didnt have the knock before until I changed the oil to Mobil 1 syn, I was running Vavoline 20-50 before.

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post #2 of 10 (permalink) Old 01-06-2003
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any engine over 75,000 miles you want to use 20w-50... i recommend Valvoline Max Life oil.

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post #3 of 10 (permalink) Old 01-06-2003
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My engine has well over 75,000 miles when I switched to 10w30 Mobil 1 synthentics without any problem and that was over 2 years ago now. It really depends on the condition of the engine.
I have some clicking and knocking when the car sits at a idle
With only 109,000 miles on your engine, 10w30 Mobil 1 synthentic oil should work fine. Find out what's causing the clicking and knocking. Valvetrain noise from normal engine wear is one thing but what you describe sounds like it could be something else.

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Last edited by ScottHalliday; 01-06-2003 at 11:26 PM.
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post #4 of 10 (permalink) Old 01-06-2003
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The oil is not the cause of your problem. The only reason i would ever tell someone not to use synthetics is if your engine already uses lots of oil. Your engine having 75K miles is not alot for a 5litre roller motor under normal driving conditions and regular maintance. Most of these oils today are marketing techniques for profit. Now you see Mobile 1 10W30 saying for higher mileage engines. Your oil pump limits pressure so using 20W50 is a waste of power when factory bearing clearances start out around .0015 anyway. Now if your turning 8500 rpm using a power adder then i would say 50 weight oil. I don't suggest using Fram filters either as i've had two internally become lose causing an oil pressure drop. Check your oil pressure with a mechanical guage under load to help determine if some bearings are going bad.
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post #5 of 10 (permalink) Old 01-07-2003
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switching to synethic shouldn't cause more noise, if anything it would clear some up due to the increased viscosity. Just run regular oil, and change it often, you dont need synthetics to make an engine run forever, changing oil often is key. i personally run 10x-40 mobil O with a quart of jacobs oil stabilizer from autozone.

as EZBNME stated , dont use FRAM. Use motorcraft oil filters.


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post #6 of 10 (permalink) Old 01-07-2003
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I recomend using motorcraft or halvoliene which are one and the same. Their is a reason why ford uses this oil from the factory.


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post #7 of 10 (permalink) Old 01-07-2003
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Synthetics in older engines isnt recommended.... Because of the engine seals... Tends to leak past um.. The rear main is very bad about it... Dont know which year seals in which engines will do it... But that's not enough for me to not use it... I've used synthetics in engines that used oil, and wore out.. And had good results with it, stoped using oil, and even seemed to run a bit better, not always the case though... What I can understand is new engine makers are claiming they will void any engine warrantys if synthetics are used... Still for the life of me cant figure out why....
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post #8 of 10 (permalink) Old 01-07-2003
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The Cobra R with the 5.4L came factory filled with 15W-50 Mobile 1 oil. All Corvettes are factory fill with Mobile 1 along with high end foreign cars using 0W-40 Mobile 1 oil as well. Auto makers cannot void a warranty due to your choice of oil as there are federal laws that protect this and why oils are rated. To many People are worried about using 5W-20 weight oil in there new Ford products such as the 4.6 Cobra etc. This oil is suggested for fuel economy and again look how the 5.4 Cobra R uses 15W-50 weight oil basically same design as 4.6 motor.
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post #9 of 10 (permalink) Old 01-10-2003
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When it come's to Motor Oil be picky because alot of oil out there
is ****. Balaso I use Mobil one 10W30 in my mustang and never
had a problem.I do use RedLine 10W30 more than I use Mobil one
10W30 because it lubucates greater under track condition's and
street duty! I highly recommed Redline or Mobil one for all Mustang's
and if you have high mileage use 10W30 because the coat's and
protect's better because of it's thickness. Balaso if you have
109,000 mile's you should expect problem's or rough idle because
of all though's mile's.I would use Valvoline Max Life as Vortex
recommed because Valvoline is great oil than coat's good to your moving
part's.Balaso that's funny because my friends' 95 GT never had any
kind of trouble useing Mobil one sny. and he has 91,533 mile's! I wish
you luck I hope you find the right oil to use.
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i use mobil 1 synthetic and my 94 gt has 97,000 miles on it, and i have no problems. But my car has ran synthetic in it since 40,000 miles. synthetic is great and i will continue to use it for the life of my car i am glad the previous owner made the switch, but It is not reccommend to switch to synthetic oil in a car with high miles.

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