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post #1 of 6 (permalink) Old 05-29-2004, 09:24 PM Thread Starter
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Motor oil thoughts.

I just changed the oil today for the first time in the Tbird (99GT motor, strim, etc)

And I sent an oil sample to the blackstone lab to check it out, i'll be sure to post the results on here also. I beleive that seabass was using 10w30 mobil1.

I was just wondering what oil you guys are running, for modded mod motors.

The car takes 5.5 quarts with the vortech and I decided to go with 4 quarts of 10w30 mobil1 and 1.5 quarts of 15w50 mobil1.

The 10w30 mobil 1 is really thin stuff, thats why i mixed it with some thicker stuff.

The car is only driven in the summer, so cold weather starts are a non issue.

Any comments, or what do you guys run?

On my 98 4.6 f150 (bone stock), I run regular 5w30 mobil 1, and 0w30 German castrol in the cold weather.

A motorcraft filter is the only one I will ever use.

JH
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post #2 of 6 (permalink) Old 05-29-2004, 10:41 PM
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1. Amen on the motorcraft filters!
2.Why mix weights?
3. I use straight 10w30 mobil 1 in the motor now that its blown , but have used 0w20 mobil 1, in the past , but its all the same sorta ....long chain hydrocarbons engineered to give max sheer and pressure protection.... most of the diff comes from viscosity modifiers added to the synthetic brew... and all that changes is flow. The greater the difference in the numeric values, the more viscosity modifier you get, so 10w30 should be as good as anything, but back in the old days, when multi viscosity oils started out, they had a lotta probs in S. Cal. due to oils "gelling" in verry hi temps, go figure.... I think a straight 20 mobil 1 might be thev best of all , but hey, what do I know?.... been useing Mobil 1 since about 1970 when it was first introduced as an experiment in the midwest, and it has never failed me..
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post #3 of 6 (permalink) Old 05-29-2004, 10:52 PM Thread Starter
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I tried the mix to thicken up the 10w30 a little bit for the hot weather.

I have read many places that the M1 10w30 is on the thin side.
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post #4 of 6 (permalink) Old 05-29-2004, 10:57 PM
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I also use Mobil 1 10w30 whenever I change the oil. Never noticed any problems with it.
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post #5 of 6 (permalink) Old 05-29-2004, 10:59 PM
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Justin,I used 5w30 for several thousand miles in my car(about 150K),and swapped to 10-w30 when the stem seals started to leak down a bit to help curb the smoking after a hot startup.
Synthetics are so stable that it's hard to shear them enough to cause damage-even with the lighter weights-so don't fear the 10w30.
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post #6 of 6 (permalink) Old 05-29-2004, 11:02 PM Thread Starter
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thanks JL.

I'll get the 10w30 analyzed and the cocktail analyzed and post the scans.

JH
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