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10-01-2007, 05:42 PM | #1 | ||
4dlvr
Join Date: May 2006
Location: tulla
Posts: 327
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ive just bought some new oil, the guy recomended 20w50 penrite, i rekon thats way too thik as i was after 15w50 or even 10w50. does any one know what the best thickness for oil is? and will running a thick oil(20w50) do any damage? the car has 115,000km
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10-01-2007, 05:53 PM | #2 | ||
FF.Com.Au Hardcore
Join Date: Nov 2005
Location: Airlie Beach
Posts: 539
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I use Penrite hpr5 which is 5 weight. afaik if the weight is to high you will put more strain on the seals. The ford book says 10/30 is standard. From what I have been told by a friend who is a ford mech, 5 weight is the way to go unless you are burning/using oil as youyr fuel econ will be better and performance can increase because the engine parts move free-er.
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10-01-2007, 05:54 PM | #3 | ||
growing up is optional
Join Date: Feb 2006
Location: Gawler area SA
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With 115k on the clock I'd go for a 20/50. 15/50 may be ok, but it may eat 10/30!!
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10-01-2007, 06:06 PM | #4 | ||
4dlvr
Join Date: May 2006
Location: tulla
Posts: 327
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should i return the 20w50 for somthing thinner like 15w50 or keep it the same????
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10-01-2007, 06:25 PM | #5 | ||
SS Grunt
Join Date: Oct 2005
Location: Melbourne-DEER PARK
Posts: 1,091
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Put in some Shell Helix Plus its semi syn and 15w-50.
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10-01-2007, 06:28 PM | #6 | ||
Just slidin'
Join Date: Sep 2005
Location: Brisvegas
Posts: 7,791
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What does the 50 stand for? Its probably a silly question, but does it matter too much about the second number?
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10-01-2007, 06:52 PM | #7 | ||
99' AU 1
Join Date: Jul 2006
Posts: 28
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autobarn has in there books to run magnetic in it 15w40 i think
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10-01-2007, 07:09 PM | #8 | ||
SS Grunt
Join Date: Oct 2005
Location: Melbourne-DEER PARK
Posts: 1,091
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10w-40 is Magna, The 50, 40, 30 part is the Hot viscosity in the summer months i would keep it to 40 as the minimum.
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10-01-2007, 07:26 PM | #9 | ||
Just slidin'
Join Date: Sep 2005
Location: Brisvegas
Posts: 7,791
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Cool. Just wondering as I always just use 15W-50, GTX3. Seems to work fine, and you get it in 5.5L bottles.
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10-01-2007, 07:38 PM | #10 | ||
FF.Com.Au Hardcore
Join Date: Sep 2006
Location: QLD
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I only work with ISO viscosity grades, but I belive the bigger number is the oil at 0 degrees c and the lower number is 100 degrees c. Oil has to accomplish two things which are at odds with each other, it has to lubricate and reduce friction and at the same time seal itself against rings and valves.
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11-01-2007, 12:03 PM | #11 | ||||
Regular Member
Join Date: Apr 2005
Location: Bunbury WA
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Quote:
when the car is hot, the 5w-50, 15w-50, 20w-50 etc oils are all the SAME thickness. the difference between them is that the 20w-50 will be much thicker when cold than hot. the 5w-50 is still thicker cold than hot, but not as much and therefore easier to pump around the engine on startup. Quote:
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11-01-2007, 01:30 PM | #12 | ||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Brisbane
Posts: 976
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whats the go for a AU 5L?
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11-01-2007, 01:33 PM | #13 | ||
growing up is optional
Join Date: Feb 2006
Location: Gawler area SA
Posts: 3,303
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Thats why I said it may, not it will.
I don't agree with the thicker oil wearing the motor out earlier. Higher fuel consumption, maybe. Lower power, maybe, but not enough to notice. I just dont think that a /30 oil will offer adequate protection for the bearings etc once the clearances open up a bit. |
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11-01-2007, 02:28 PM | #14 | ||||
Regular Member
Join Date: Apr 2005
Location: Bunbury WA
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Quote:
i'm using 10w-30 atm to see how it goes, but when i spoke to the Centre Ford service dept they said you may have oil consumption issues with a 30 grade, so they recommended use 40 - so far i haven't burnt any oil so i'll see what happens. Quote:
is it fair to assume that if your engine is not consuming oil, then the clearances are still good enough to run the original grade oil safely? i don't dispute anything you said there, i was really commenting on the idea that seems to come up a bit that people think as soon as you're over 100k, you need thicker oil, and so they go from the originally-recommended-30-grade to a penrite 25w-60 or something - from one extreme to the other - when a 40 would probably have done nicely... |
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11-01-2007, 03:03 PM | #15 | ||
growing up is optional
Join Date: Feb 2006
Location: Gawler area SA
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Thats what the forums are all about, sharing knowledge gained either thru experience or research, and there will always be differing opinions.
I agree with what you said about the 100k mentality, it isnt the beginning of the end for the engine. The use of /30 oils concerns me, only because manufacturers specify them to get better fuel consumption to help win the sales race, with little rergard to engine longevity. For long term engine protection i would prefer a /40 oil, and this is what I recommend to my customers, especially when they start to rack up a few km's. When its 40+ degrees and you're cruising at 110kph for a few hours, maybe even towing a trailer or caravan, I'd like a thicker oil than 10/30 splashing around in my sump. Dont get me started on 15,000km service intervals either! |
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11-01-2007, 03:16 PM | #16 | ||
Regular Member
Join Date: Apr 2005
Location: Bunbury WA
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ok thats cool... so if i change my earlier question to refer to 40 grade, which is also recommended for most of the ford 6's and 8's i think (don't they usually say to use 30 or 40?)... so long as the engine isn't consuming oil, is it fair to say that regardless of the number of k's its done the 40 grade oil is still protecting the engine?
i guess if the rings were good but bearings weren't, then this test wouldn't work, so i suppose its a question what wears quicker - is it rings or bearings? |
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11-01-2007, 03:33 PM | #17 | ||
growing up is optional
Join Date: Feb 2006
Location: Gawler area SA
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/40 grade oil should be fine, yes.
As far as rings or bearings wearing quicker, thats a tough one! I suppose oil consumption will test the ring condition, and oil pressure would indicate the bearing clearances and therefore wear. I'd be more worried about keeping the rotating parts in good condition, not waiting until they wear out, before choosing an oil grade. |
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