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Old 03-21-2015, 05:04 PM
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Join Date: Sep 2014
Posts: 397
STP Engine Flush

Is it OK to use STP engine flush before my next oil change, I saw the product on the shelf today and picked it up, I am ready to put 10W-30 in my engine this week, I just want to get the dirty stuff out if at all possible. What is the exact oil capacity with a new filter? Thanks.

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Old 03-21-2015, 05:16 PM   #2
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Location: The hills of Virginia
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The 4.0L takes six quarts. Personally I wouldn't use a flushing product unless there were indications of sludge build up ( take a peek in the oil fill hole). Oil over it's time of use cycle does get dirty in appearance, if it isn't then there is an issue.

Me, Banditt, Tippie and ole Heep a long!
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Old 03-21-2015, 05:17 PM   #3
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Won't hurt, but like any engine additive it's highly unlikely it does anything. As for the change itself I buy 6 quarts and it's usually filled with 5.5 or ao
Poverty/College Budget 2004 TJ 2.5" RC coils, 1.25" BL, M95 shocks 4.5" up 4.75" down travel front, 4.7" up, 5.3" down rear

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Old 03-22-2015, 04:33 AM
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I will give it a shot if it will not harm my engine. Thanks for your input.
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