27 replies to this topic

[TheRealVXed]

 

 

 

 

 

 

Dirty derv' s

Yea, apart from the higher compression they have an easier life than a petrol engine.

Apart from the compression ratio,
the oil soot loading causing 3rd body abrasion,
the high soot content EGR that blocks EGR valves,
intake manifolds and (with low pressure EGR) causes acids,
water and soot to condense in the intercooler
The (for a given emission level) more complicated aftertreatment
higher torque transmission
Higher vehicle weight

yes, they have a much easier life

Re higher torque: wife's car is still on original clutch after the 300k miles, no major components have been changed
Not sure it has an intercooler, but the exhaust is original, so acids can't be too bad? Old model I know
Re soot etc, cleaned it out about 50k ago by accidentally filling it with petrol and driving c 150 miles on petrol ( car was almost empty when I put the petrol in, recovery man ( it ran ok but refused to start when I stopped) said the petrol will have cleaned it out

I'm sure. There's loads of empirical evidence of diesel engines outliving petrols.
 

No, there are a lot of higher mileage diesels than petrols. That doesn't mean they last longer, it means they are a better choice for high mileage driving. Very few people are picking petrols to drive 100+ miles a day. Don't confuse correlation for causation.

I guess we'll know in 10 years time when we all switch back to petrol...

 

 

My dad had a Saab 9-5 Griffin (GM Petrol V6) which he did nearly 300k miles in.  Not sure whether it is still around these days as he got rid in 2012, but he then had a 9-3 Aero (same engine I think) which he did over 200k in, so maybe they are as reliable as diseasels

[Bargi]

Matt Farah’s Lexus LS400 Finally Hits A Million Miles

 

https://www.youtube....h?v=Z7mm0XNHdhw

[JG]

 

 

 

 

 

Dirty derv' s

Yea, apart from the higher compression they have an easier life than a petrol engine.

Apart from the compression ratio,
the oil soot loading causing 3rd body abrasion,
the high soot content EGR that blocks EGR valves,
intake manifolds and (with low pressure EGR) causes acids,
water and soot to condense in the intercooler
The (for a given emission level) more complicated aftertreatment
higher torque transmission
Higher vehicle weight

yes, they have a much easier life

Re higher torque: wife's car is still on original clutch after the 300k miles, no major components have been changed
Not sure it has an intercooler, but the exhaust is original, so acids can't be too bad? Old model I know
Re soot etc, cleaned it out about 50k ago by accidentally filling it with petrol and driving c 150 miles on petrol ( car was almost empty when I put the petrol in, recovery man ( it ran ok but refused to start when I stopped) said the petrol will have cleaned it out

 

 

I'm sure. There's loads of empirical evidence of diesel engines outliving petrols.
 

 

 

No, there are a lot of higher mileage diesels than petrols. That doesn't mean they last longer, it means they are a better choice for high mileage driving. Very few people are picking petrols to drive 100+ miles a day. Don't confuse correlation for causation. 

 

 

120 miles a day (3 days a week) in a 3L turbo petrol S4.

[ChrisS1]

Dirty derv' s

Yea, apart from the higher compression they have an easier life than a petrol engine.

Apart from the compression ratio,
the oil soot loading causing 3rd body abrasion,
the high soot content EGR that blocks EGR valves,
intake manifolds and (with low pressure EGR) causes acids,
water and soot to condense in the intercooler
The (for a given emission level) more complicated aftertreatment
higher torque transmission
Higher vehicle weight

yes, they have a much easier life

Re higher torque: wife's car is still on original clutch after the 300k miles, no major components have been changed
Not sure it has an intercooler, but the exhaust is original, so acids can't be too bad? Old model I know
Re soot etc, cleaned it out about 50k ago by accidentally filling it with petrol and driving c 150 miles on petrol ( car was almost empty when I put the petrol in, recovery man ( it ran ok but refused to start when I stopped) said the petrol will have cleaned it out

I'm sure. There's loads of empirical evidence of diesel engines outliving petrols.

No, there are a lot of higher mileage diesels than petrols. That doesn't mean they last longer, it means they are a better choice for high mileage driving. Very few people are picking petrols to drive 100+ miles a day. Don't confuse correlation for causation.

120 miles a day (3 days a week) in a 3L turbo petrol S4.

Boring question alert.

What kind of mpg are you getting James?

[JG]

 I do about 25k a year in it, and over 18 months (from new) i think i'm averaging about 28. It will do 35 on the mostly motorway commute. 

 

not bad for a slush box, 4wd, 365hp car. 

[Ivor]

Still going, 307,000 just passed mot, new discs, pads, and a caliper on the rear, and patch a small hole in the still original exhaust. Far from a perfect car but it's longevity is remarkable, 60mpg yesterday ....

[Zoobeef]

I just hit 281k. Did the cambelt a few weeks ago, water pump was weaping so good job really.

[Nev]

After my 2 recent Euro trips I'm tantalisingly close to a humble 200,000 miles. The 1.6 TDi engine is great, good compression, starts on the button and is super economical. It's all the other bits of the car that are dieing slowly!