Mixing engine oils?

As i said i dont care about the mileage, i'm changing it when the oil gets to orange zone on the lubricheck device, and that can vary between 7 - 10K Km. while on the other's at 3.5-5K were on red zone... but nobody uses Penrite here cos it's not on the market :cool:

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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:cool:

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Just a side note.

Those Lubricheck devices are a great concept..

You do realise though that they quote that the "Titanium" Castrol fluids can and do give false readings due to their additive package..

So your oil may be returning a false reading..

Perhaps some independent lab analysis of your oil at the same time is in order...

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Originally Posted by Tombie

You do realise though that they quote that the "Titanium" Castrol fluids can and do give false readings due to their additive package..

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It means that it has a hell of a additive pack:D ... i missed that false reading thing, thanks for noticing, i'll make some investigation but i can't find here any semy oil to be better than a fully for the Td5 even if i swap to the Comma PD which is also recommended for EUI engines

Hey Sierrafery,, just what brands do you get "West of Transylvania" :D

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Originally Posted by Pedro_The_Swift

Hey Sierrafery,, just what brands do you get "West of Transylvania" :D

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Most likely bright red, but a pain in the neck getting it:Rolling:

From various sources i have read that the base viscosity of a synthetic remains pretty consistent irrespective of the additive condition; mineral oil (and semi synthetic I assume ) viscosity reduces as the additives wear out.

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Originally Posted by Pedro_The_Swift

Hey Sierrafery,, just what brands do you get "West of Transylvania" :D

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Anything but Penrite :cool: ... actually on the factory fitted silencer of my engine there is a sticker with the whole range of Mobil 1 fully synth oils with the graphic of ambient temps how they should be used attached :confused:

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Originally Posted by bsperka

From various sources i have read that the base viscosity of a synthetic remains pretty consistent irrespective of the additive condition; mineral oil (and semi synthetic I assume ) viscosity reduces as the additives wear out.

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And there's the catch - once the additive package is worn out it doesn't matter - the oil needs changing.

According to Mobil, Mobil Delvac esp 5w 40 is perfectly ok for the td5, the suggested cam wear is more than balanced out by it being less carbonising in effect less wear.

Lets say in both cases additives are half exhausted at oil change (not exhausted, which would be worst case scenario). A 5W-40 synthetic would still be around the 40 grade, I understand mineral would be more 25 or less. Mineral would be blacker due to oil degradation, which it's additives are suspending in the oil itself. Engine deposits are also higher due to mineral oil degradation.

Have a look at this Audi engine (84k miles without oil change). Either type won't survive this long.. https://www.aulro.com/afvb/images/im...016/09/613.jpg

http://jalopnik.com/what-happens-if-...-fo-1692660828