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#1
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2.7 Oil Sludge Problem
I've read a lot of the numerous posts concerning the sludge problem in
the 2.7's. I've noticed that many of the complaints Chrysler addressed were "up to the 2002" model year. Was the situation corrected/improved in the 02? TIA Bill. |
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#2
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2.7 Oil Sludge Problem
"Bill" > wrote in message ups.com... > I've read a lot of the numerous posts concerning the sludge problem in > the 2.7's. I've noticed that many of the complaints Chrysler addressed > were "up to the 2002" model year. Was the situation corrected/improved > in the 02? > TIA > Bill. > Yes, especially when the oil is changed every 3k or 3 months and use synthetic with the proper weight. Coasty |
#3
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2.7 Oil Sludge Problem
Bill wrote:
> I've read a lot of the numerous posts concerning the sludge problem in > the 2.7's. I've noticed that many of the complaints Chrysler addressed > were "up to the 2002" model year. Was the situation corrected/improved > in the 02? > TIA > Bill. > See recent posts on this Bill. There apparently were some modifications made that reduce the sludging tendency and that also make it less sensitive to the presence of sludge. Rumor is that the biggest changes began in the 2003 model year. The main changes are reported to be significantly reduced operating temperature and larger diameter oil gallery passages. As Coasty mentioned, using synthetic oil in this engine should essentially eliminate the high-temperature sludge/varnish problem. At the very least make sure that any oil you use meets Chrysler Material Spec MS-6395, whether it's synthetic or non-synthetic. Depending on which brand/type of synthetic is used, you definitely could extend the oil drain interval well past 3000 miles to help offset the additional cost of the synthetic, especially in the more recent model years. I have a 2001 2.7 that will reach the 150K mile mark in another couple of days. Until recently it has had 3000 mile oil/filter changes with good quality non-synthetic oil (mainly Castrol GTX and Valvoline Maxlife High Mileage). I did two experimental 4000 mile runs this year with 2 different synthetics and had the oil analayzed at the end of each run. One synthetic, made by Shell, was pretty much at the end of it's life by 4000 miles. The other synthetic was Quaker State Q Advanced and it definitely had some life left in it at 4000 miles; I would say it could have gone another 1000 miles but that would have been it. In different engines (like the Chrysler 3.5L or nearly any other non-turbo engine), both of these oils would have gone a lot farther than 4000 miles before reaching the point they did in my 2.7. My next move will be to move up a *true* synthetic like Mobil 1, Amsoil, Redline or Pennzoil Platinum and repeat the tests. These should go alot farther than the Shell or Quaker State synthetics did before they need changing, and should not leave any deposits if changed in time. The 2.7L is hard on oil, no question about it. The newer ones are apparently less harsh than the older ones. Phil |
#4
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2.7 Oil Sludge Problem
Bill wrote:
> I've read a lot of the numerous posts concerning the sludge problem in > the 2.7's. I've noticed that many of the complaints Chrysler addressed > were "up to the 2002" model year. Was the situation corrected/improved > in the 02? > TIA > Bill. The one that I know first hand about is the addition of an in-line heat exchanger added to the PCV hose - steals heat from the coolant system to keep blow-by gases from condensing out and clogging up and dissolving the walls of the PCV hose, which they were prone to do. I think that change was made to productuon cars starting in either '00 or '01. It can be added to earlier ones (I added it to my '99 Concorde). I have also read that the oil pump was upsized to provide better lubrication to the rear mains - that was also an early change - maybe '00. Certainly there have been other changes that I don't know about that others can discuss. Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my address with the letter 'x') |
#5
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2.7 Oil Sludge Problem
Thanks for all the info. I'll start a gradual switch-over to synth. next oil change (I have GTX in it now.) This car has what might be the worst life - short drives in town and most of the time it barely reaches op. temp. Thanks, Bill |
#6
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2.7 Oil Sludge Problem
Bill wrote:
> Thanks for all the info. I'll start a gradual switch-over to synth. > next oil change (I have GTX in it now.) This car has what might be the > worst life - short drives in town and most of the time it barely > reaches op. temp. > Thanks, > Bill > That's a bit of different situation then Bill. In your case, if you want, you could stick with straight non-synthetic and just change it frequently. Moisture and fuel dilution - both from short trips and low operating temps - contribute to low temperature sludging and loss of viscosity (thinning of the oil). The best remedy for this is frequent oil changes. You can minimize this to some degree by taking it out on the highway once or twice a week for a 10 - 20 mile spin. The type of driving you describe is classified as "Severe" service in the owner's manual, hence the more frequent oil change schedule. In your case you aren't wearing out oil due to prolonged highway driving or prolonged stop and go driving in high outside temps - both of which shear the oil and lead to high temperature deposits (high temperature sludge/varnish). Those situations are where synthetic really has the most benefit. Phil |
#7
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2.7 Oil Sludge Problem
Phil T wrote:
> Bill wrote: > >> Thanks for all the info. I'll start a gradual switch-over to synth. >> next oil change (I have GTX in it now.) This car has what might be the >> worst life - short drives in town and most of the time it barely >> reaches op. temp. >> Thanks, >> Bill >> > That's a bit of different situation then Bill. In your case, if you > want, you could stick with straight non-synthetic and just change it > frequently. Moisture and fuel dilution - both from short trips and low > operating temps - contribute to low temperature sludging and loss of > viscosity (thinning of the oil). The best remedy for this is frequent > oil changes. You can minimize this to some degree by taking it out on > the highway once or twice a week for a 10 - 20 mile spin. The type of > driving you describe is classified as "Severe" service in the owner's > manual, hence the more frequent oil change schedule. > > In your case you aren't wearing out oil due to prolonged highway driving > or prolonged stop and go driving in high outside temps - both of which > shear the oil and lead to high temperature deposits (high temperature > sludge/varnish). Those situations are where synthetic really has the > most benefit. Good poit. It's also the ideal situation for an additive like MMO or Sea Foam. I know some people are dead set against any additives. However, I look at it this way: I think it's bad practice in general to put a torniquette on your arm or leg, but there are certain situations in which it might just save your freakin' life! Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my address with the letter 'x') |
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