Thread: TD5 Oil Report.

I watched this video. It would appear the viscosity breakdown is due to the stability of the viscosity modification polymers they use. It would appear that some oils have more stable polymers than others. Other than trying and testing I've got no idea how I can find out which ones are better.

This is above my pay grade.

At least I know it's a thing. I wonder if someone has done the test. The problem is companies change their chemistry all the time. Other than testing..

Originally Posted by Captain_Rightfoot

That's why I shared the oil report. I found it really fascinating that my 5w-40 after 5000k was dropping in viscosity without fuel dilution. The fact that the oil analysis place highlighted it as an abnormality suggests it's of concern.

It would have been really really interesting to get the oil report on the 5w-30 but I'm not going to do the experiment myself.

It's worth noting that the book says 30, 40, 50 are all acceptable oil grades in a TD5.

I promise will update this next test.

There's a thread in General Chat from Dec 2024 titled 'Modern OEM engine oils' or similar.

At the time I posted this:

'A couple of weeks ago my sister bought an Isuzu ute with about 120 thou on it. Pretty much like new. She lives in the sticks.

A few days later she told me the oil light came on, but she kept driving to work.

It wasn't the oil light we all know well, but a 'degraded oil' warning (kinda like reduced oil pressure before the serious light comes on)............. so she puts it in for an immediate service.

The owner's handbook specifies all sorts of grades including 10-30, 10-40. I told her to go for 10-40. They put 15-40 in and the trip computer thing is still reading 8 litres per 100kms, i.e. no real difference in mileage.'

From memory someone also posted something about degradation of synth vs mineral oils............ you might find it of interest.

DL

Originally Posted by Captain_Rightfoot

I watched this video. It would appear the viscosity breakdown is due to the stability of the viscosity modification polymers they use. It would appear that some oils have more stable polymers than others. Other than trying and testing I've got no idea how I can find out which ones are better.

This is above my pay grade.

At least I know it's a thing. I wonder if someone has done the test. The problem is companies change their chemistry all the time. Other than testing..

What a great video, geeky stuff. With engine oils being multi-grade, I guess the solution is to just change it regularly.

In terms of changing oils, I thought this one was really interesting. It is in relation to viscosity, operating conditions and engine wear. Its also worth a watch.