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#1
08-07-2003, 10:14 PM
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’84 300D Turbo: extended 80-90+ MPH cruising?
As durable as they are, I don’t want to blow the engine; it’s turning at pretty high revs in that speed range. Any thoughts (other than legal ramifications)?
I won't let the temp guage get too much higher than normal running conditions (82-85 Celcius), but what about using a thicker oil due to the heat stress? Thanks In Advance! Glenn 84 300D - 226,000+ miles 
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#2
08-07-2003, 10:30 PM
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My 83 TD likes running at 73-78 mph.
Once I ran her approximately 125 miles, never dropping below 85 and traveling at 90+ most of the way. On that trip I experienced what I believe to be a lot of misting of the oil which overwhelmed the separator and flooded the air cleaner housing. For a week after that trip, I had rough starts and a lot of blue smoke for 45-90 seconds after start-up. I guess overnight the excess oil was draining into the turbo housing or being sucked into the intake tract. Once that excess oil had been consumed, the smoking quit and the starting was easier too. Now, I limit my extended high speed travel to <80 mph. Anyway, it's about as fast as I feel comfortable going on the roads I drive.
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Never a dull moment at Berry Hill Farm.
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#3
08-07-2003, 10:42 PM
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I brought my '83 from Houston, TX to Michigan at speeds of 85-90 in a straight trip. It touched 3 digits from time to time and seemed to be very happy up there.
I often run trips of 500-600 miles at heavy speeds. I have never noticed any adverse mechanical issues. Don
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DAILY DRIVERS: '84 300DT 298k (Aubrey's) '99.5 Jetta TDI IV 251k (Julie's) '97 Jetta TDI 127k (Amber's) '97 Jetta TDI 186k (Matt's) '96 Passat TDI 237k (Don's '84 300D 211k Mint (Arne- Undergoing Greasecar Conversion) SOLD: '82 240D 229k (Matt's - Converted-300DT w/ 4 speed 
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#4
08-07-2003, 11:35 PM
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I haven't had any problems either. I've driven from K.C., MO to St. Louis, MO and back a few times, cruising at between 80 and 100 for almost 4 hrs each way. One time I was actually passed by another 300D turbo with four people in it. Its not something I would do all the time, though. Other drivers make me more nervous than the car, which has not given me any mechanical problems in 9 months.
When I frist bought the car I posted regarding the revs, which do seem high. If I recall, its around 4K at those speeds, and I think the cut off is 4250. But, I used to cruise my little MGB-GT at over 4K for hour after hour (no OD), and I seem to have heard these diesels like the revs. I've noticed after prolonged highway driving my diesel runs better around town, too.
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#5
08-08-2003, 01:09 AM
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Quote:
I know that I've got a taller rear end gear ratio, but I'm at 3000 RPM even at 70, and I do'nt think I've ever had it up to 4000 RPM except for while accelerating. My car wants to do 80, but I can't afford the ticket...
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2001 VW Jetta TDI, 5 speed, daily driver 1991 Ford F-350, work in progress 1984 Ford F-250 4x4, 6.9l turbo diesel, 5 speed manual Previous oilburners: 1980 IH Scout, 1984 E-350, 1985 M-B 300D, 1979 M-B 300SD, 1983 M-B 300D Spark-free since 1999
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#6
08-08-2003, 05:20 AM
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They will go fast enough to get you a brief chat with officer Friendly; I'm working on that issue right now.
But, don't fear the revs. These aren't long stroke engines, they want to spin....plenty in here on that subject.
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Never a dull moment at Berry Hill Farm.
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#7
08-08-2003, 05:38 PM
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i ran my 84 300d turbo from fla-ct earlier this year (1300 miles) at mostly 80mph with no problems or additional oil consumption. it seemed to like that speed a lot (so did i, hehe
 )in fact it got better mpg than at slower speeds 
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1984 300D Turbo - 231k....totalled 11/30/07 RIP
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#8
08-08-2003, 05:45 PM
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Quote:
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198? 300D ???K - Future DD 1989 300TE 285K - traded in '12 1984 300SD 186K - Sold in 08 1978 300SD 330K - Died in 05
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#9
08-09-2003, 01:30 AM
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don't forget to let it idle for a few minutes before every shut down at those speeds unless you carry a spare turbo.........
William Rogers.......
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#10
08-14-2003, 11:30 PM
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To ned2683
Ned,
Yeah, I live in K.C., MO, going to UMKC law school. I visit St. Louis every once in a while. Talk to you.
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#11
08-15-2003, 12:24 AM
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It's my understanding that diesels like running at fast speeds for extended periods. I've never had any ill effects of running mine up there.
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1984 190D 2.2 Auto 220k 2001 Jeep Cherokee Sport 70K 2004 Lexus RX-330 ??K 2005 Chrylser Crossfire LTD 6K Play guitar? Go to www.cyberfret.com for free online lessons!
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#12
08-16-2003, 12:26 AM
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hey!! im from bethany mo. work in k.c. mo. drive my 85 300D 200 miles round trip 5 days a week, 310k miles still running strong!! who else is from missouri???????? maybe we should get together sometime!! maybe meet at hooters for wings!!! hehehe
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matt
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#13
08-16-2003, 01:20 AM
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It doesn't hurt a diesel one bit, instead it is good for you to run it hard once in awhile to clean it out. I been a heavy equipment repairmen for 25yrs. Had a Perkins diesel in my Chevy 1ton in 1970, ran wide open most of the time for my to hit freeway speeds. Will run funny for a short period as it cleans out the cylinders. Slight upgrade best place to do it, keeps you from getting speeding ticket.
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