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Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. #5281823 12/01/19 09:57 AM
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crainholio Offline OP
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Vehicle is our 2005 Mercury Mariner 3.0L V6 at 201K miles. It was bought new, I ran Motorcraft syn blend 5W-20 for the first ~120K miles at 5K OCIs, it developed a valvetrain tick on cylinder 6 (transverse mounted engine, front right cylinder left exhaust valve lash adjuster) at operating temps, so I switched to Mobil-1 High Mileage, then PU which finally stopped the noise, then PPHM or Valvoline synth HM after PU was discontinued. This was when I noticed oil consumption becoming an issue, so I switched to conventional PYBHM 5W-30 this year (2 OCIs thus far) which did not improve consumption. Hot valvetrain tick came back at some point, however it appears intermittently.

Problem: Consumes about 1/4 quart every two weeks at ~200 miles of commuting, the drive is 10 miles one way. It leaks a small amount at the front crank seal, possibly the oil pan also...but not nearly enough to account for the volume of oil loss. I replaced the PCV valve with a new Ford piece last year, no change in oil consumption. There were and still are indications of excessive crankcase pressure such as oil residue around the outside of the PCV seal. I verified the PCV tube and vent tube were both unobstructed and no cracks/breaks during the PCV valve change last year.

Current fill of PYBHM 5W-30 is at 3,800 miles, I added 16oz of Kreen and ran it up to temp on a vigorous drive. Wife will continue commuting in it, I'll monitor oil consumption as usual, and I'll change the oil at 5K as usual.

The other 16oz Kreen will go in at ~2.5K miles on that OCI (unless there's a case to be made for adding it immediately, I'm open to feedback).

My thinking is that Kreen treatment will confirm or rule out stuck rings and/or clogged piston oil drain passages. At 201K it's very possible that the rings are just plain worn. No visible oil smoke on cold startup, coasting downhill, or accelerating uphill.

Re: Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. [Re: crainholio] #5281827 12/01/19 10:01 AM
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dogememe Online Content
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I bought an 08 Escape V6 with over 200K and then sold it to my coworkers daughter about 20K miles later. It also had excessive oil consumption. I did disclose the oil consumption to the buyer lol and we have since tried various brands and viscosities of oils and nothing helped. Changing the PCV valve did improve it a little bit, from like 1 quart per 1000 miles to about half that. No external leaks and no exhaust smoke. Engine is still very quiet - no noises.

I am interested how your experiment goes. If it helps we'll try it too.

Last edited by dogememe; 12/01/19 10:02 AM.

2010 Ford Escape 2.5 ~102K Miles: Castrol Magnatec 5W-20, Wix Filter.
2001 Chevy Suburban 5.3 ~289K Miles: Unknown Oil, Filter.
Re: Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. [Re: crainholio] #5281865 12/01/19 10:46 AM
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bullwinkle Offline
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May seem hard to believe, but Valvoline (conventional) MaxLife has improved conditions like yours for me in the past (XJ 4.0 in my sig & others).


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. [Re: crainholio] #5281881 12/01/19 11:07 AM
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DrDanger Online Content
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1 more vote for MaxLife

Last edited by DrDanger; 12/01/19 11:09 AM.
Re: Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. [Re: crainholio] #5282022 12/01/19 01:17 PM
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SatinSilver Offline
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Conv. Valvoline really a syn-blend has worked the best in my experience for oil consumption. I'd try that next in the 5w30 variety. Report back the results. I'd give it a few intervals. After that try out Valvoline Maxlife red bottle syn-blend 5w30.

Currently running PU 5w20 and it's used a half quart over 5k miles. Previous oil changes were with the above and it didn't use any measurable amount. It's possible after a few intervals that there wouldn't be consumption but PU isn't widely available or the price is too high.

Re: Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. [Re: crainholio] #5282039 12/01/19 01:44 PM
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incognito_2u Offline
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Subscribed.........Out of all the “Snake-oils” out there, I’m a true believer in Kreen.
Keep us informed on the outcome. thumbsup


2006 Jeep Commander 3.7 V6 -115k (M1EP5W30/XG3600)
2006 Toyota Corolla 1.8 VVTi -84k (M1EPHM5W30/XG3600)
1999 Toyota Corolla 1.8 -88k (PUP5W30/XG4386)
1998 Toyota Corolla 1.8 -67k (QSUD5W30/XG3600)
Re: Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. [Re: crainholio] #5282108 12/01/19 03:01 PM
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ET16 Offline
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I had a similar engine in a Mazda van. I used Lubro moly motor oil saver.

Re: Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. [Re: crainholio] #5282621 12/02/19 07:36 AM
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crainholio Offline OP
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Thanks folks, Valvoline it will be. I see on their website that neither the Daily Protection conventional nor MaxLife synth blend are D1G2 certified, just SN+. The engine is DOHC fixed timing, no VVT but it has a long timing chain.

I assume the lack of D1G2 cert is just a cost avoidance measure on Valvoline's part, and not an indication that their oils don't adequately minimize timing chain wear...any thoughts?

Re: Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. [Re: crainholio] #5283237 12/02/19 06:02 PM
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burla Offline
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Adding kreen to crank case for stuck rings? Or gas tank?

Kreen is the real deal, but it is an aggressive treat. Put that in crank case and you might clean some stuff too quickly for the engines liking. Alternatively, adding it to the gas tank might not be as good as adding a PEA cleaner. If I was worried about stuck rings I think I'd look at running sea foam through vac lines or si_1 through gas tank, or both.

Re: Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. [Re: crainholio] #5283240 12/02/19 06:05 PM
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burla Offline
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If you wanted to commit to kreen maybe pull the plugs and do a piston top soak, maybe use a turkey baster or something and drop in on piston tops.

Re: Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. [Re: crainholio] #5286693 12/06/19 08:33 AM
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crainholio Offline OP
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Update: in the 4 days of commuting (~80 miles) since adding Kreen, the oil on the dipstick went from dark brown and translucent to black and opaque. Surprising given the maintenance and use of synthetic oils. Maybe not surprising given the short commute.

Piston soak suggestion is appreciated, but that will be after the next OCI. Accessing the rear spark plugs involves removing the intake manifold and that will wait until warmer temps. For now I'll let the Kreen do it's thing in the crankcase, then change to Valvoline MaxLife synth blend red bottle and monitor oil consumption. 2nd dose of Kreen near the end of that OCI if needed.

If oil consumption continues to be a problem, it'll be Spring by then and better conditions to disassemble the intake manifold.

Re: Kreen experiment: '05 Mercury Mariner w/ oil consumption issue. [Re: crainholio] #5286796 12/06/19 10:52 AM
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Kreen is old school and really works if your consumption issues are from carbon build up. A bit in the fuel cleans the cylinder head and the entire PCV system benefits as the vapors flash off when the engine heats up.

I have used it with great success on a bunch of oil burners, it is an amazingly effective product. No piston soaking needed, just repeat as needed...


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