I said Iíd share some personal service procedures. I was going to get into transmissions, rear ends and other areas in another thread for the benefit of all. But with all the distractions time wonít allow it, if ever. Perhaps if I get enough requests Iíll do something on my blog next year or on a small lube group I have on Yahoo. Since this treadís intention was about the safety of using synthetics in engines, Iíll continue to finish what I started in this regard.
My 07 Cobalt 2.2 Ecotech uses an OLM= oil life monitor. Now, Iíll admit this engine is not very hard on oil. FYI this car gets about 80% of itsí mileage on the highway.
At 1,400 I swung synthetic in along with my break-in additive mix. Around 6,500 miles I dumped it and used the same synthetic. At the second oil change the OLM was around 25% and I had reset it at 1,400. At 1,400 miles it was at 90%. Due the math, had I not reset it at 1,400 at 6,500 it would have been around 15%.
I have seen a couple setups like mine run over 8,000 miles before the OLM hit zero and have reports of a few at 8,500 or so.
Iíll not run my Cobaltís OLM to zero on conventional but I will on the current cycle with the XL 7,500 mile oil.
The next change itís getting 5W-30 Ė ASL 15-25,000 mile or a once a year oil. Unless a year passes first Iíll run the OLM to zero, reset it and run it down to 50%. Then Iíll run a UOA and see how things look, Iíll estimate at that time Iíll have about 11-12,000 miles logged in that cycle.
Like the Hyundai/Kia 100K warranty GM gives me a 100K-mile drive line warranty.
I can, by the limitations of my warranty, run my OLM to zero or change oil once a year, which ever comes first and use conventional 5W-30 that meets GM spec 6094M, which most 5W-30 oils do. FYI GM spec 6094M is a cold flow test.
Now a critic might say something like, ďThere goes your nice warranty with that 15,000 mile oil changeĒ. Amsoil will warranty my engine against oil related failures if I change the oil & filter per their recommendations plus I have the magneson-moss act on my side.
Our 2002 Olds Alero V-6, which I gave to our daughter 3 years ago will typically not trigger the OLM until around 4K if city driven which it gets a lot. Iíve seen it go as far as 6,800 miles before the OLM is triggered if 80-90% highway driven.
Around 5,000 I swung synthetic in it. Since I run synthetics here too I allowed the OLM to trigger and typically I had let it run another 2,000 miles or so until last Dec.
Since last Dec. the Olds has our TSO 0W-30 in it. TSO is an oil for up to 35,000 miles for normal service, 17,500 severe. Thereís about 13,000 miles on the cycle and the OLM has triggered 4 times in about 11 months.
Donít try my Olds work without guidance but it looks great!!!!!!!
Other than a leaky intake manifold gasket on the Olds, which this engine was known for & covered under warranty at 49,000 miles itís been a stellar performer. Should also mention the intake leak was found in a used oil analysis that I normally do on a car that is close to leaving warrantable guidelines. This car has 142,000 miles on it and still gets mid 30s for highway mileage.
An OLM has no clue whatís in the engine for oil. They were programmed based on properties of conventional oils meeting certain specs and those specs are not unusual. OLMs record engine RPMs, frequency of starts, lengths of starts, the type of driving youíre doing, engine temps, continual TPS movement etc.
I could get into a couple downfalls with OLMs but time wonít allow.
Now I can hear it, ďI donít have an OLM on my Mustang & KiaĒ. I know and my Sonata, Jeep & Vibe donít. My new Rondo wonít either.
The Vibe is short tripped to death and has about 35k miles. The vibe gets an oil change twice a year on XL synthetic, normally every 5,000 miles or so.
The 93 Jeep I-6 & is a beater I have out of state. Been using a HDEO synthetic for about 5 years, had used 5W-30 synthetic since about 40K miles. This poor thing has over 275K miles on it but the driveline is fairly sound. Now oil gets changed every fall or early winter, as it doesnít get used much from X-mas thru late April.
30 years ago I would have been fearful in running anything past 4,000 until I got into synthetics. Then 4K to me was high risk but if you could have seen the insides of some of my engines even back then youíd see the light.
Engines of 30-40 years ago were also much harder on oil than most of todayís engines unless you only know stop and wide open plus oil technology has made vast improvments both in conventional and synthetic.
Iím running out of time. Thereíll be more regarding our viscosity discussion.
Last edited by cmhj2000; 11-28-2007 at 05:25 PM.