Synthetic oil for GU 3.0 TD ???

Hi Andrew, If you are looking at extending oil change intervals, why not look at a BY-PASS filter, filters down to 1 micron, I have been only changing the oil in my GU 4,2 td at 20, 000 km intervals since 100,000, the end of the warranty period, Now with 265, 000ks on the clock its still as good as ever. It also protects the Turbo with no solid particles entering the bearings. It will also save you money, save on oil, The original spin on filters dont clog as the particles are picked up by the BY-PASS filter, I change the BY-Pass filter every 2,500ks, it costs $5.00 and 700ml of oil top up. Change the spin ons at 20,000ks and the oil, the savings are huge. Also spend less time under the bonnet and more time using your vehicle. If you use a synthetic oil,the lubrication may be better but if you extend the oil change intervals, you are loading the oil with more abrasive carbon. Just a thought, Michael

We use Mobil synthetic oil for oil our diesel vehicles including the tractors and farm equipment.
We use off-line filtering on all our equipment and change the oil every 12 months.
If the vehicles or equipment is not fitted with off-line filtering we fit it ourselves in the farm workshop. We change the main and off-line filters at 6 months.
We did use Mobil oil testing for 2 years but found the oil was more than capable going the 12 month changes.
My personal Pajero which does up to 50,000 k in 12 months gets changed at 30,000 k. My Pajero work is 70% highway 30% off-road

Andrew, We use Valvaline in our 3.0ltd also our trucks, change oil at 5,000 & filter at 10,000 50,000 no trouble, trucks 1,000,000 no trouble oils cheap insurance. Standard filter is excellent so my mech say's & he's been looking after diesel's for 40 years.Regards Bob
Wish i was still here / Gulf in July

Have two diesels in the family, Both with bypass filters- a '91 TD 42 and a diesel Gemini- (1981) both owned since new and both never been touched as far as the engine is concerned.
I change the oil in the TD 42 about every 20,000klms - although oil analysis says I could go further, I do it that "often" for piece of mind.
The Gemini diesel has well over 300,000klms and has had about two or maybe three "oil changes" in it's life and the engine is as good as new- despite being thrashed in recent years by two sons learning to drive and subsequently driving it to uni etc.
However when the bypass element is changed you top up the oil so it gets a little bit of new oil regularly....
I would HIGHLY recommend a bypass filter before you worry too much about synthetics etc.... that can come later if you like.