3.9L V8 Longevity - Defender Source
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View Poll Results: 3.9L Owners- How many miles have you accumulated without a major overhaul?
<100K 3 12.00%
100K - 149K 10 40.00%
150K - 199K 8 32.00%
200K - 249K 1 4.00%
249K - 300K 2 8.00%
>300K 1 4.00%
Voters: 25. You may not vote on this poll

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  #1  
Old May 17th, 2011, 09:19 PM
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Ross Simpson
1995 D90 ST/2006 D3 HSE7
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Arrow 3.9L V8 Longevity

Hello Gents,

Having just surpassed 146k miles on the odometer of my 95' D90, I've begun to wonder just how much life the little 3.9L V8 has left in her. Although she appears to be leaking from every imaginable crevice, compression numbers are healthy and power is good (well, unless you have the A/C on and a truck full of people!).
Another driving factor is the 300tdi conversion; so very tempting! May be an option down the road, but I'll stick with the V8 until the end; great engine, IMO. Back on point:

What mileage are you seeing out of your 3.9L's without major overhaul?
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  #2  
Old May 17th, 2011, 09:25 PM
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Phillip
1995 SW #487/500
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Im sure it will be across the board. Keep em cool and serviced I think 200-250k shouldnt be unreasonable.

This is like asking "whats the best mud tire"
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  #3  
Old May 17th, 2011, 09:27 PM
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Ethan
'73 SIII/ D90 Hybrid
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I've seen many trucks at the shop that break the 200k mark. Change your oil, mind the headgaskets, and you should be good to go!
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  #4  
Old May 17th, 2011, 09:36 PM
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Tom Rowe
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I only got 265k out of the one in my '95 Disco because it overheated severely several times when I first had it.
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  #5  
Old May 17th, 2011, 10:46 PM
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Ross Simpson
1995 D90 ST/2006 D3 HSE7
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250k+ miles would be about all I expected. Interestingly, my father has a 2001 GMC Sierra equipped with a 5.3L V8...440k miles on the original engine and trans and still going strong! No engine work whatsoever; just Mobil 1 oil changes every 5k miles since new.

On a side note- it appears that I need to lay off the crack pipe before starting "polls"! The options won't quite cover what I'm after, will they!? Great posts though- much appreciated!
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  #6  
Old May 18th, 2011, 01:29 PM
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Craig Dickson
1995 D90 Red Soft top
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I am at 265,000 now. Only changed head gaskets
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  #7  
Old May 18th, 2011, 01:34 PM
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Bryan Barnes
95 D90 2.8TGV
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Join Date: Feb 2005
Location: Nemo, TX
Posts: 68
Mine made it to 146K before I had a slipped liner and converted to diesel.
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  #8  
Old May 18th, 2011, 04:29 PM
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Tony Sims
1984 110
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My 3.9 was still going strong at about 152k, when Thirsty the RRC went endo. I bought it back from the insurance company, pulled a few bits off and sold it on to Columbia Rovers, and I believe the engine went into another truck. It was the antithesis of all the BOP/Rover V8 horror stories -- no leaks, no problems. I was the 3rd owner beginning at 120k, and the second owner was pretty good with scheduled maintenance.
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