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Joined: Feb 2003
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Hard-core CEG\'er
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Hard-core CEG\'er
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damn 5,000 miles between changes. hmmm.....i spend alot of moolah on royal purple and replace it 3,000-3,500. is it proven you can go through longer intervauls of changing oil with sythetic? ive heard it, but is it actually OK?
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Joined: Feb 2001
Posts: 750
Veteran CEG\'er
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Veteran CEG\'er
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Well, I'm no expert at all, I just noticed that with the
synth (even with the blend) the oil starts darkening much
later (sometimes it's still honey colored after 2k miles)
and judged by my high-precision finger feeling and eyeballing
it still has the same viscosity at 5k miles as it was at the
beginning.
Also part of the truth that I do very little stop'n'go traffic
and short drives and frequently make long (several hundred miles) trips.
Tiv
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Joined: Oct 2000
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Hard-core CEG'er
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Originally posted by mycainsbroken:
damn 5,000 miles between changes. hmmm.....i spend alot of moolah on royal purple and replace it 3,000-3,500. is it proven you can go through longer intervauls of changing oil with sythetic? ive heard it, but is it actually OK?
This has been proven by several people on this site, using oil analysis at intervals up to 7500 miles.
These Guys at Paradise Garage just went 18,000 miles on a single fill of Mobil 1, and it's not even designed for extended drain intervals. They're going to try Amsoil next, so they should see some really high mileage with that one.
I have followed the car manufacturer's interval on every car I've owned since 1990. On my old Honda, that meant 7500 miles, and on this car, 5,000. And that's with dino oil. I use synthetic now, and I feel even better about going 5k.
The 3k interval is mostly outdated "wives tale" stuff that we learned from our dads. It made sense on my 69 Beetle, but it doesn't make sense on a modern car, especially with synthetic oil and quality filtration.
Function before fashion.
'96 Contour SE
"Toss the Contour into a corner, and it's as easy to catch as a softball thrown by a preschooler." -Edmunds, 1998
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Joined: May 2000
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Hard-core CEG'er
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Hard-core CEG'er
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Originally posted by RogerB:
Originally posted by mycainsbroken:
damn 5,000 miles between changes. hmmm.....i spend alot of moolah on royal purple and replace it 3,000-3,500. is it proven you can go through longer intervauls of changing oil with sythetic? ive heard it, but is it actually OK?
This has been proven by several people on this site, using oil analysis at intervals up to 7500 miles.
These Guys at Paradise Garage just went 18,000 miles on a single fill of Mobil 1, and it's not even designed for extended drain intervals. They're going to try Amsoil next, so they should see some really high mileage with that one.
I have followed the car manufacturer's interval on every car I've owned since 1990. On my old Honda, that meant 7500 miles, and on this car, 5,000. And that's with dino oil. I use synthetic now, and I feel even better about going 5k.
The 3k interval is mostly outdated "wives tale" stuff that we learned from our dads. It made sense on my 69 Beetle, but it doesn't make sense on a modern car, especially with synthetic oil and quality filtration.
Yeah,
I watched that study and I think either Redline or Amsoil is next.
One thing to consider is they had a lot of "makeup" oil added due to oil consumption, 4 oz samples and a filter change.
I think he did the math on Bobistheoilguy.com and the "average" age of the oil in crankcase when drained was really only about 10K miles.
I just ran my 94 Geo 82xx miles on Mobil1 in 120 days. I'm waiting for my oil analysis to come back any day now.
TB
"Seems like our society is more interested in turning each successive generation into cookie-cutter wankers than anything else." -- Jato 8/24/2004
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Joined: Sep 2003
Posts: 11
New CEG\'er
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New CEG\'er
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Originally posted by BOFH:
The 3k interval is mostly outdated "wives tale" stuff that we learned from our dads. It made sense on my 69 Beetle, but it doesn't make sense on a modern car, especially with synthetic oil and quality filtration.
Besides, is engine wear really what kills cars these days? So what if running Mobil 1 and changing it every 3000 miles extends engine life to 250,000 miles or whatever. The car still rusts out or you get rear-ended by a drunk or the suspension/steering/clutch/whatsit goes and would cost more to repair than the car's worth. For a daily driver, I wonder if it really makes any sense to obsess about engine wear, when chances are you're going to be replacing the car by 150,000 miles anyway.
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Joined: May 2002
Posts: 21,653
I have no life
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I have no life
Joined: May 2002
Posts: 21,653 |
I plan to keep my car until it dies, then get it running again and repeat this process as necessary. I don't really use mobil1 for the longer engine life, but more so because of the better idle it gave me. The longer engine life is just a plus.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
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Joined: May 2000
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Hard-core CEG'er
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Here are my oil analysis results from the Geo Prizm with just a shade under 8300 miles on Mobil 1 Tri-Synthetic (the previous formula)  Pretty good results, don't ya think? TB
"Seems like our society is more interested in turning each successive generation into cookie-cutter wankers than anything else." -- Jato 8/24/2004
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Hard-core CEG'er
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What kind of oil and air filters?
Function before fashion.
'96 Contour SE
"Toss the Contour into a corner, and it's as easy to catch as a softball thrown by a preschooler." -Edmunds, 1998
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Joined: May 2000
Posts: 2,127
Hard-core CEG'er
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Hard-core CEG'er
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Originally posted by RogerB:
What kind of oil and air filters?
Oil:
I started with a Purolator standard filter and after the 3xxx mile analysis, with the note about the insolubles being up, I swapped out the filter (can do it from the top of the engine) with a Purolator PureONE.
Here are the results with IIRC 3161 miles on that same oil. You can see the results in the analysis posted above, but you cannot see the comments from the lab.
http://tlcc2000.dyndns.org/Oil_Analysis/1994-Prizm-Oil-Analysis-2003-07-28.jpg
Air:
I think it is an STP or similar. I bought it at AutoZone. May go look at the genuine Toyota filter to see if it is a better quality unit.
I'll probably pull the filter housing and clean it up good as well.
"Seems like our society is more interested in turning each successive generation into cookie-cutter wankers than anything else." -- Jato 8/24/2004
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Joined: May 2000
Posts: 2,127
Hard-core CEG'er
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Hard-core CEG'er
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PS,
I think I could probably go 180 days or about 12000 miles between changes, if I wanted to without major drama, as long as I do a filter change and top up the oil every ~3K
TB
"Seems like our society is more interested in turning each successive generation into cookie-cutter wankers than anything else." -- Jato 8/24/2004
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