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Originally Posted by Chris142 Not every 0331 head cracks. Odds are that if it has not cracked yet it's not going to. On a pool we took at one of my jeep forums I go to seems most cracked between the 100-150k miles....I'm not out of the range yet lol...

Originally Posted by benjy my aunts 99 cherokee sport is great except the typical RMS leak, 9x,xxx miles 10-30 supertex + wix filter every 6 months as it only get short trips 1 to 2 thou every change. faded paint good interior + wherever she parks theres someone looking to buy it, engine is...

Well crap just realize this test does not check for coolant but I guess since it checks for water its still good?

FL400s filter

Originally Posted by Chris142 Check the oil pan bolts on the driver's side where it's right next to the pre cat's. That's where they usually leak from and tightening those bolts usually stops that leak. Wanting to remove the oil pan as I know the RMS is leaking some but going to be another...

Originally Posted by JLTD Looks fine...with the 5.75 TBN you can probably go 7500 miles. The 4.0 throws a lot of iron, so 10ppm at 3,000 miles is good - my last 4.0 had about 60ppm at 10,000 miles. Thanks for the words of encouragement on the TBN. I have been doing some google research on...

Strange thing is the 2000 came out with the 0331 heads which is known to crack. I don't know the history of this vehicle. Motor has somewhat low oil pressure was 8psi hot idle but 50 psi driving (verified with mechanical gauge) and is little noisy on bottom side but have not had time to verify...

Here is my oil sample just got back. The Cherokee hardly gets driven so it sits lot. I'm using Rotella T5 10w30 although this time had to top off with some T6 15w40 (about 1/2 quart if that much...yes its a Jeep so it leaks some). Sample was taken at a 3k interval as I'm trying to get a baseline...

Manage to find a 5q jug of Mobile 10w30 syn that I forgot I had and used it soay try the JEGs later on. Napa had a online monthly sale of their 10w30 syn (Valvoline)for $3.99 but guess because I reserved it on the 2-28th and went to purchase it on 3-1 they could not get the system to give it to...

Originally Posted by kstanf150 If QS makes Jegs oil You better buy it It's [censored] good oil !!👠I don't know....it sells for 3 dollars and change a quart. I would like to know what corners they cut.

Originally Posted by PimTac Originally Posted by REC Just read on another forum that its made by Quakerstate....really? Who makes Quaker State? SOPUS Products, a division of Royal Dutch Shell

Ok here is the syn one..but still looks different

Don't know bottle is shaped little different...

Just read on another forum that its made by Quakerstate....really?

Originally Posted by ka9mnx Motorcraft is not a durable oil and at 5k you are already at the limit. On my 2011 Fiesta they recommend MC syn blend 5w20 and change at 10k.

Noticed that JEGS sales there own brand of oil and for the price thinking about trying it out as I'm looking for synthetic 20w50 for my ZT. I tried using google but really isn't not much out there on it. Saw pics of bottle on their website but did not show any info where made except in the USA...

Well looks like I'll just stay with the motorcraft synthetic blend. Thanks for the info!

I was thinking that due to the short distances especially in winter time as it really does not reach operating temp the synth. oil would lubricate more efficiently.

Hello, I have a 2006 fusion with the v6 and thinking about changing over to synthetic oil due to it only gets drive short distances (about 3 miles a day) and is classified as extreme driving.Right now it has about 20k on it. Would I benefit from this from a mechanical standpoint or is using...