Oil Change query

**rapserv** · 2nd March 2014, 01:48 PM

going to do an oil change as part of my routine maintenance and just had a thought on another item that was recently raised again on the forum.
I have used Penrite HP Diesel 5 this time around and found it to be ok except for the fact that when checking the oil recently (after about 7000km use) it seems to be very thin... almost like water on the dipstick (in its viscosity that is) ... wondering if this is normal for Diesel 5. A few tests indicate that there does not seem to be any diesel in the oil.
The second part to my query is that I normally use an oil flushing agent before doing a new oil change and because the flushing agent thins the oil even more, is there a higher possibilty that oil from the sump could more easily leak past the rings increasing the possibility of a diesel runaway

**DeanoH** · 2nd March 2014, 02:33 PM

Presumably you have a Td5 ? Why are you running such a 'thin' oil, are you travelling in Antarctica or the high Andes where it's very cold ?
According to the LR manual a 5W-40 oil is OK down to -30 degrees C, not many places in Australia get this cold. The more commonly available and cheaper 10W-(anything) will cover you (according to LR) for -10 to +50 degrees C which seems a better option to me.

We've had the Td5 D2 since new and it has always been LR dealer serviced with Castrol Magnatec 10W-40, can't see any point in using thinner oil.

As to the oil appearing thin on the dipstick, the upper (in this case 40) figure specifies a viscosity range that an oil must meet at 100 degrees C, perhaps the lower the viscosity W (minimum viscosity when cold) then the lower the viscosity within the defined range at 100 degrees C.

Deano

**rapserv** · 2nd March 2014, 06:52 PM

Originally Posted by DeanoH

Presumably you have a Td5 ? Why are you running such a 'thin' oil, are you travelling in Antarctica or the high Andes where it's very cold ?
According to the LR manual a 5W-40 oil is OK down to -30 degrees C, not many places in Australia get this cold. The more commonly available and cheaper 10W-(anything) will cover you (according to LR) for -10 to +50 degrees C which seems a better option to me.

We've had the Td5 D2 since new and it has always been LR dealer serviced with Castrol Magnatec 10W-40, can't see any point in using thinner oil.

As to the oil appearing thin on the dipstick, the upper (in this case 40) figure specifies a viscosity range that an oil must meet at 100 degrees C, perhaps the lower the viscosity W (minimum viscosity when cold) then the lower the viscosity within the defined range at 100 degrees C.

Deano

thanks for your reply deano,
I've always run Nulon 15W-40 and never had any issues, however, last year I went through posts on this forum to find what others were using in their TD5's. The view of many experienced users was that they were using HPR Diesel 5 so I thought I would give it a try. The oil has not been an issue to me other than the fact that when hot it is very thin.
For info check this article http://www.penriteoil.com.au/pis_pdfs/0HPR%20DIESEL%205.pdf

**lyonsy** · 2nd March 2014, 08:09 PM

the winter viscosity or weight of the oil is the base so if you have a 5w thats the base of the oil what ever it goes above that is by different viscosity adders over time these break down and the oil will reduce its hot viscosity untill when total shagged its the same as the base.
any 5w-20-30-40-50 oil be fine for the first 5000km after that sheer and other issues will start coming up.
also rember that one way that a 5 oil helps protect is also by pumping more of it then a 10 or 15 base oil will.
but if in doubt test it out oil test kits are pretty cheap

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