Thread: Mixing engine oils?

[quote=thai_tiger;2586231]

Originally Posted by Tombie

Has given poor results in cam and injector lobe wear in a TD5...





can you show your reference for that comment.

Having been a member for a long time it's long since gone from my feed.

It was conversion including myself, JC, Rick130 and others.
As tuners, mechanics, lubrication specialists etc we have observed this and found less wear in oil testing etc.

I'd suggest you google search Aulro.

Originally Posted by Tombie

Has given poor results in cam and injector lobe wear in a TD5...

Penrite Semi-syn has proven a much better oil in a TD5 for reduced wear..

I was told by a good LR indie a few years back the same.

[quote=Tombie;2586274]

Originally Posted by thai_tiger

Having been a member for a long time it's long since gone from my feed.

It was conversion including myself, JC, Rick130 and others.
As tuners, mechanics, lubrication specialists etc we have observed this and found less wear in oil testing etc.

I'd suggest you google search Aulro.

checked the Aulro search didn't come up with anything Mobil Delavc esp specific but does mention mobil 1, is this what you remember.
Delvac is a premium grade oil that out performs nearly all, I'm surprised you don't rate it. If your correct about damage to cam etc then I need to know and change preference.

Originally Posted by bsperka

I would have thought the base oils were part of the issue. Synthetic starts at the higher viscosity and viscosity doesn't degrade as much as mineral?

I'm not sire what you mean by this ?

If Penrite doesnt recommend the fully synth then IMO some other fully synth which is recommended should be the choice... i'm using Castrol Edge TD 5W40 fullyn synth which is also recommended for the VW PD(EUI) engines which are almost the same with Td5... Though i dont want to argue on this, i rely on my Lubricheck and that's my own conclusion

Originally Posted by Tombie

Has given poor results in cam and injector lobe wear in a TD5...

Penrite Semi-syn has proven a much better oil in a TD5 for reduced wear..

Mobil1 10W-30 is a definite no no (and possibly 0W-40, although I think Slunnie runs/ran it ?) IMO in a TD5.

M1 in dual spec petrol/diesel versions just don't have the EP additives need for the heavily loaded injector lobes in a TD5.
Basically any oil that meets the ILSAC GF-4/5 spec isn't robust enough for the TD5.

Older versions of Delvac 1 (CI-4 and CI-4+) were very good, but I don't have any data from or could recommend the most recent versions.

As Mike said the additive package is more important than the base oils, unless you are taking oil change intervals out to 20,000km+, then the full syn will show better oxidation stability and lower wear metals, etc.
Mostly the premium syn oils also have the better additive packages, but that isn't always the case.

Put it this way, an average full syn oil gives less protection than a very good, heavily additised full mineral oil over shorter mileages.

I'm sorry, I don't have any data to hand to back that up, it's only heresay and lets face it, anyone can claim anything on the interwebs but all that I can say is that the oil analyst I've used over the last fifteen years, a bloke I pay money to to analyse my lab results and give me advice on oils has recommended a full mineral oil over all but one synthetic on a couple of occasions.
No names no pack drill as it's privileged information, and FWIW those full mineral oils were eye wateringly expensive here in Australia.

One example I can give is Penrite's prime race diff oil, their Pro Gear 85W-110 fluid.

It's a full mineral oil with a special borate ester EP additive package as opposed to most blenders sulphur/phosphorous additive package.
Texaco in the US were the first to develop borate ester additised gear oils. they are very good.
Unfortunately from an off-roaders perspective their ability to handle water dilution isn't good, they tend to be highly miscible with water and lead to rapid seal degradation.

just to confirm mobil 1 delvac esp 5 w 40 is not suited to the td5


thx

Originally Posted by sierrafery

If Penrite doesnt recommend the fully synth then IMO some other fully synth which is recommended should be the choice... i'm using Castrol Edge TD 5W40 fullyn synth which is also recommended for the VW PD(EUI) engines which are almost the same with Td5... Though i dont want to argue on this, i rely on my Lubricheck and that's my own conclusion

Your engine. Your choice....

But synthetic is not the be all and end all...... especially at 12k service intervals....