I also use Penrite 15w50 Diesel Semi Syn. I've had my current GQ TD42 for almost 13 years and done about 170,000km in that time (It's just clicked over 420,000kms).
My GQ TD42 before that I had for 100,000kms.
I've used the 15w50 exclusively and checked the dipstick before each 5000km service and never lose anything off the dipstick.
The engines love it, Penrite used to (might still?) recommend the 20w60 and I tried it once but the engine lost power and the ability to hit the higher rpm.
I read all the time that people love the 15w40 (Delo and Castrol IIRC) in TD42s but I just think it's too thin, especially since I added the turbo.
I'm really happy with how my engines are reliable and quiet. So thumbs up to the 15w50 and here's to the next 270,000kms of trouble free touring!
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