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Old 10-13-2002, 04:05   #1 (permalink)
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Question Best oil for 5ltr v8

Just did an engine oil change over the weekend in the xr8. Thought i'd try the mobil S semi synthetic 15-50w this time. I had previously used the shell helix synthetic 15-50w.

What are all you other 5 litre owners using and anyone got there opinions on which are best and worst?
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Old 10-13-2002, 04:20   #2 (permalink)
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Well most important that you change the oil/ filter frequently. For me a thicker synthetic 15-25/50 or a blend is good for 5 ltr thinner for twin cams.Some companies say there oil is synthetic but all it is, is filtered mineral oil with some additives. I think it was Mobil that sued Caltex for saying there oil is synthetic in U.S. Being that there is no grade to say what oil realy is, Caltex won.. Other than that the price will give you some idea.. I have also heard from an expert oil tech that 20% synthetic added to good mineral makes it 80% better...So blends I guess are o/k.. Better on seals also..Synthetic tends to dry them out, making them alittle brittle..
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Old 10-13-2002, 04:42   #3 (permalink)
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i've got an edxr8 and i just changed the oil and put in valvoline durablend....it's semi synthetic and is 15w50....
had it in for about 3 weeks and it is still really clean, seems like pretty good oil!
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Old 10-13-2002, 05:49   #4 (permalink)
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Shel Helix Plus 15W-50 or even better Ultra 5W-50
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Old 10-13-2002, 21:35   #5 (permalink)
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Yeah, I use Shell Helix Ultra 10W40. Seems to work okay in my highly modified beasty. Having said that, the only reason I'm not using Mobil 1 is because the engine builder told me to use Helix.
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Old 10-13-2002, 23:12   #6 (permalink)
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Quote:
Originally posted by SiKEDXR8
i've got an edxr8 and i just changed the oil and put in valvoline durablend....it's semi synthetic and is 15w50....
had it in for about 3 weeks and it is still really clean, seems like pretty good oil!
Not having a go mate but being clean after 3 weeks isnt exactly a good thing. It means that the oil isnt doing its job at suspending all the crap within the engine ie dirt debris carbon etc.
Or maybe your car is running perfectly without any contaminents whatsoever...... Hmmmmmm I think not.:oo1:
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Old 10-14-2002, 03:03   #7 (permalink)
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well the oil isn't black it has only changed colour a bit....
and anyway the more crap the blacker the oil right, where should all the crap be coming from?
If it isn't black could that mean the filter is doing a better job?(dunno just a guess, correct me if im wrong...)
btw are all oil filters built the same or are there really good ones?

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Old 10-14-2002, 03:27   #8 (permalink)
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btw what sort of stroker kit do u have svo302 and where from?
oh and how many kilowatts?
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Old 10-14-2002, 04:10   #9 (permalink)
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I have used the shell helix for 2 years now and just upgraded to
motul semi synthetic 15-50w. and its great
5L will set u back about $35.00. and so far so good

There's my 2c worth

PS: Im also useing a Fleetgard filter (as seen on trucks/earthmovers)
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Old 10-15-2002, 23:22   #10 (permalink)
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I use durablend in my 5.0, and it works well.

Oil colour doesn't mean much. I had a 345,000km Toyota work hack on Natural Gas (CNG) and it's oil would gradually darken over about 20,000km to be dark honey coloured, but still transparant. Because it was a gas fuel, it wouldn't wash the oil off the bores. A petrol engine tends to wash the oil off the bores especially at cold startup, and into the sump where it oxidises. Also burning petrol completely is much more difficult that natural gas, so gas combustion is much more complete than petrol. Part of the blackness in the oil is a result of carbon particulate buildup from this incomplete combustion.

But, black oil doesn't do any major harm to an engine. It also make the dip stick easier to read.

Cheers
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