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Old 07-13-2003, 21:23   #1 (permalink)
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Mobil1 - VCT Engine

Does anyone with an (AU) XR6 VCT engine run Mobil 1?

Reason why I ask is because the oil cap says to use 30w-50w oil only. Mobil1 is 5w-50w.

Running a thinner oil would perhaps cause some extra engine noise, but otherwise I can't think of too many other problems it would cause.

Anyone have any thoughts on this?
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Old 07-13-2003, 23:11   #2 (permalink)
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Re: Mobil1 - VCT Engine

It's best to use what Ford recommend, and a 5W-50 is more suited to Tasmania than Qld.

Why do you want to run a thinner oil?
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Old 07-14-2003, 00:15   #3 (permalink)
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Thinner oils usually tend to work better with performance engines.

Synthetic oils prolong engine life.

I guess I am mystified as why Ford would stipulate a 30w-50 oil for the XR6, and companies such as Mobil and Castrol push their synthetic products so hard...
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Old 07-14-2003, 00:34   #4 (permalink)
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Re: Mobil1 - VCT Engine

It's called marketing. If you have plenty of money and want to use a synthetic try a 15 or 20W something. Factory specs are there for a reason, and we must assume they know more than us (well the engineers, anyway)

As an aside, Ford Europe only recommend a 5W oil for Scandanavian countries, you know those ones close to the North Pole :)
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Old 07-14-2003, 02:19   #5 (permalink)
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Re: Mobil1 - VCT Engine

That weight that's written on the cap is the hot viscosity so ford recommends a ?w-30, ?w-40 or a ?w-50 where ? is the cold viscosity..

Use a thinner cold oil viscosity when you want thinner oil at startup, etc.. The recommendation for hot viscosity is so people don't go running really thin or thick oil all the time.. Like gear oil or tranmission fluid.. that'd mess up you engine good and quick..

Dan..

PS. Go the 30 or 40 weight when the car is new and move to a 50 when it gets some kay's on it.. 200 000+ or when it starts to show some age.. Depending on maintenace and condition of course..
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Old 07-14-2003, 02:27   #6 (permalink)
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Re: Mobil1 - VCT Engine

Ford are possibly refering to mineral oils...
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Old 07-14-2003, 04:55   #7 (permalink)
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Mobil 1 is very slippery and will give the best HP on a dyno. There is a tradeoff however ..... oil analysis had shown that Mobil 1 gave a signifcantly higher wear coefficient than the other synthetic oils in a test conducted by Greg Brindley in Fast Fours mag about 4 yrs ago. Can't remember if it had something to do with wear once oil was at operating temp or something but the results sure suprised me.
I'd stick to the std oil spec but maybe go semi-synth to stick within oil specs for engine. Last thing you want it to do is to start using oil.
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Old 07-14-2003, 16:19   #8 (permalink)
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Thanks for the replies.

I ran my previous car (4 cyl DOHC) on Mobil 1 and it never missed a beat. Ran just as hard after 160,000 km as it did new.

Sort of want the VCT to be doing the same...

I guess, as TopGhia said, Ford engineers must know what's best for it.

I'd still be interested in knowing what other VCT's are running out there though...
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Old 07-14-2003, 16:32   #9 (permalink)
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Re: Mobil1 - VCT Engine

I Use a 10w-50 Pentrite for My Au with 115,000 Km on the clock. On the back its says it meant for motors with specs listed at 10w-30, 10w-40, 10w-50. My car is listed to run 5w - 30 But i have noticed that the sieres 2 onwards were changed to 10w - 30 which sort of makes me think the Au series ones were meybee getting some niose so they chnaged the specs to 10w - 30. Plus im running LPG and i think that little bit thinker is a better option.
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Old 07-14-2003, 16:34   #10 (permalink)
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Re: Mobil1 - VCT Engine

Somebody correct me if I'm wrong, but wouldn't a 5w be better at startup?
Reasoning being: Thinner oil, pumps up quicker, therefore it starts protecting the motor sooner.
Does that sound right to you guys?
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