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  #1  
Old 11-26-2009, 10:37 PM
cmac2012's Avatar
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I might be pushing my luck but on my 325i e-30 I go about 7500 on synthetic. No reason to regret it so far - been doing it from when I got it (214K) to the present, 303K.

Also, I dropped down to mid range gas (89 octane) a few years after I had it, and about a year ago, went down to regular (87 around here) on the advice of another MS shop member. No pinging, so sign that it was a mistake . . . so far.
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  #2  
Old 11-26-2009, 11:29 PM
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Quote:
Originally Posted by cmac2012 View Post
I might be pushing my luck but on my 325i e-30 I go about 7500 on synthetic. No reason to regret it so far - been doing it from when I got it (214K) to the present, 303K.

Also, I dropped down to mid range gas (89 octane) a few years after I had it, and about a year ago, went down to regular (87 around here) on the advice of another MS shop member. No pinging, so sign that it was a mistake . . . so far.
Maybe a bit much for my taste but the M-20 engine is one of the toughest, longest lasting little engines out there! Just keep good maintnace on it, valve adj. and t-belts etc. and it will go a long time! They have diesel like longevity! No real reason to run high octane gas in them, they dont have as high compression or nearly as picky as the newer engines
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74' Datsun 510 wagon
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  #3  
Old 11-27-2009, 12:26 PM
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Funny thing, oil. I have known a fellow with an '83 Chrysler 4 with 280.000 miles, said his nephew, a mechanic advised him to use Mobil 1 synthetic, not change it, mind, but just add as needed. The goddamn car seemed as good as new. My Gramps Stearns-Knight was another vehicle that suffered {benefitted} from infrequent lube changes...Approx, 350 thousand mile later, it seems to have borne fruit as I drive it weekly.
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Old 11-27-2009, 01:03 PM
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When I had the FIAT 128 Wagon, I'd drive 60 miles a day, highway. After a fresh LOF (with Castol GTX 10W40 during the warm month(s), 10W30 during the winter), I'd get 33 MPG.

Around 2.5K-3.0K, my mileage would start to drop off...by the time 3K was clocked on odo, I was down to 24-25 MPG...

I'd head off and do a LOF...the MsPG would jump right back up to 33 MPG.

Coincidence? I don't think so.

You could stick your index finger and thumb in the old stuff...you could "feel" the "sticktion" between the digits...still somewhat slippery, but not like out of the can. Stayed with that routine ever since 'til...

'Til the MOBIL 1 phase, I changed the oil and filter at 3K tops...and I felt like a criminal going anywhere over that...now, anything MOBIL 1 gets changed at 6K and I'm still running, trouble-free, on the same engine...that S-10 has 317K on the odo and I made the switch back about mid-150K.
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'10 - Dakota SXT - Daily Ride / ≈ 172.5K
.'76 - 450SLC - 107.024.12 / < .89.20 K
..'77 - 280E - 123.033.12 / > 128.20 K
...'67 - El Camino - 283ci / > 207.00 K
....'75 - Yamaha - 650XS / < 21.00 K
.....'87 - G20 Sportvan / > 206.00 K
......'85 - 4WINNS 160 I.O. / 140hp
.......'74 - Honda CT70 / Real 125

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  #5  
Old 11-27-2009, 04:44 PM
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Quote:
Originally Posted by Carleton Hughes View Post
My Gramps Stearns-Knight was another vehicle that suffered {benefitted} from infrequent lube changes
It is said you have to wear chain mail underwear when you drive those...
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  #6  
Old 11-27-2009, 09:07 PM
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Quote:
Originally Posted by Jim B. View Post
It is said you have to wear chain mail underwear when you drive those...
and nothing else?
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  #7  
Old 11-27-2009, 10:15 PM
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I've seen much worse that that on older engines. Today's oils are so much better than those of 20-30 years ago that heavy sludge is a much rarer occurrence than it once was.
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  #8  
Old 11-27-2009, 03:46 PM
cmac2012's Avatar
Me, Myself, and I
 
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Quote:
Originally Posted by mytmousemalibu View Post
Maybe a bit much for my taste but the M-20 engine is one of the toughest, longest lasting little engines out there! Just keep good maintnace on it, valve adj. and t-belts etc. and it will go a long time! They have diesel like longevity! No real reason to run high octane gas in them, they dont have as high compression or nearly as picky as the newer engines
I've heard that those engines are bullet proof. I need to adj. the valves. It's been a while.

T-belts, I done got religion on that one. A new one every 50K. I once saw a 325 motor splayed out awaiting a re-build after a T-belt broke. A third to half of the valves bent to hell. I'll be doing a third one in about 10K.
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1984 300D, 138K
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