Thanks a lot, This is super helpful. I will ask the dealer for a quote on the job. Appreciate sharing the bills

 

Do any of the above recommended part replacements apply to the Td6? Obviously completely different engines but there may be corresponding risks.

 

No, these parts are only for the supercharged V6 and some of these parts are shared with the V8 used in other JLR products. Td6 is a completely different engine and doesn't share anything with the AJ126. The V6 was developed by Ford and the PSA Group (Peugeot and Citroen) and has been in production since 2004. The AJ126 supercharged V6 went on sale in 2012, and is based on the AJ133 V8 that went into production in 2009. When Ford sold JLR, JLR bought the rights to the engine, but it was still produced at a Ford engine plant in the UK. This is how this engine became available in the F-150 for a few years.

The biggest problem with the Td6 is that it is prone to crankshaft failure. I've seen crankshafts snap as soon as 10k miles, and I've seen cars with 120k with no issues. When the crankshaft goes, you'll need a new engine. The F-150 doesn't have this issue, as it has a forged crankshaft with bespoke rod bearings, compared to the aluminum crankshaft used in the JLR products.

 

Thanks for the history and Td6 details! I was aware of the Td6 crankshaft issue, the root cause and consequences of which are covered in

.

After seeing that YouTube video, I switched to 5W-40 synthetic diesel oil (Amsoil Signature, to be exact), which is what I use in my GMC Duramax Diesel truck.

 

Have you noticed in any improvements after switching ti 5w40?

 

What’s the general mileage range of crossover pipe failure everyone is seeing? Seems as low as 60k but more likely 75k + from what I’ve seen

 

It's been a hot summer here (the hottest on record) and the engine seems to run more smoothly, which (if true) could be due to the added film strength between the crankshaft and main bearings of the higher viscosity oil. I didn't expect to see any noticeable operational improvements and only wanted to increase the longevity of the engine. The Disco is now over 7 years old but only has a little over 60,000 miles on the odometer. It's always garaged and still looks new, and I plan to keep it until the engine quits or the transmission fails, either of which would not be worth repairing.

The main reason that I switched to 5W-40 is because it's a diesel. Since yours is a petrol engine you should stick to 5W-30.

 

It varies - On my old LR4 it happened for the first time at 29k miles - my warranty expired a month after the dealer fixed it, and I replaced them twice again before I sold it at 95k miles. On my D5 they went at 37k miles five years into ownership. On my cars, They seemed to have deteriorated every 4-5 years, as I averaged less than 8000 miles a year, mostly city miles and always garage-kept. If you drive more frequently, they usually have to be replaced at or before 70k.

Here's a link to the direct replacement metal pipes from RKX: https://www.rkxtech.com/products/rkx...44378830045483

 

I wanted to conduct a small experiment and see how it turns out.

I removed 7.5 liters of Kirkland 5w30 full synthetic oil from my vehicle after 1500 miles. I refilled with Valvoline Euro 5w40 full synthetic.

Recorded the videos of engine sounds at new 5w30 oil , 1000 miles oil and 1500 miles.

Now starting to record the sounds at new 5w40. FWIW the engine sounds happier than 5w30, a lot quieter and sounds like a sewing machine.

Compared to the 0w20 that I removed (originally in the vehicle when I purchased it) its a far cry interns of smoothness of how the engine sounds,

My mall and school shuttle commute is pretty routine, Will post the finding after a month .